Add pycompat warning

Use buildx
Adds ability to run specified alerts on startup
2024-11-14 13:09:23 -08:00 · 2024-04-03 12:15:11 -07:00 · 2024-04-03 12:03:17 -07:00 · 2024-04-03 11:28:01 -07:00 · 2023-08-11 06:20:35 -07:00 · 2023-08-11 06:20:15 -07:00
31 changed files with 2143 additions and 393 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -1,13 +1,100 @@
 ---
 kind: pipeline
 name: test
 steps:
  - name: build
    image: golang:1.12
    commands:
      - make build
  - name: test
-    image: golang:1.12
+    image: golang:1.20
    environment:
      VERSION: ${DRONE_TAG:-${DRONE_COMMIT}}
    commands:
      - make test
  - name: check
    image: iamthefij/drone-pre-commit:personal
 ---
 kind: pipeline
 name: publish
 depends_on:
  - test
 trigger:
  event:
    - push
    - tag
  refs:
    - refs/heads/master
    - refs/tags/v*
 steps:
  - name: build all binaries
    image: golang:1.20
    environment:
      VERSION: ${DRONE_TAG:-${DRONE_COMMIT}}
    commands:
      - make all
  - name: compress binaries for release
    image: ubuntu
    commands:
      - find ./dist -type f -executable -execdir tar -czvf {}.tar.gz {} \;
    when:
      event: tag
  - name: upload gitea release
    image: plugins/gitea-release
    settings:
      title: ${DRONE_TAG}
      files: dist/*.tar.gz
      checksum:
        - md5
        - sha1
        - sha256
        - sha512
      base_url:
        from_secret: gitea_base_url
      api_key:
        from_secret: gitea_token
    when:
      event: tag
  - name: Build and publish docker images
    image: thegeeklab/drone-docker-buildx
    settings:
      repo: iamthefij/minitor-go
      auto_tag: true
      platforms:
        - linux/amd64
        - linux/arm64
        - linux/arm
      username:
        from_secret: docker_username
      password:
        from_secret: docker_password
 ---
 kind: pipeline
 name: notify
 depends_on:
  - test
  - publish
 trigger:
  status:
    - failure
 steps:
  - name: notify
    image: drillster/drone-email
    settings:
      host:
        from_secret: SMTP_HOST  # pragma: whitelist secret
      username:
        from_secret: SMTP_USER  # pragma: whitelist secret
      password:
        from_secret: SMTP_PASS  # pragma: whitelist secret
      from: drone@iamthefij.com
--- a/.gitignore
+++ b/.gitignore
@ -16,4 +16,6 @@
 config.yml
 # Output binary
 minitor
 minitor-go
 dist/
--- a/.golangci.yml
+++ b/.golangci.yml
@ -0,0 +1,36 @@
 ---
 linters:
  enable:
    - errname
    - errorlint
    - exhaustive
    - gofumpt
    - goimports
    - gomnd
    - goprintffuncname
    - misspell
    - tagliatelle
    - tenv
    - testpackage
    - thelper
    - tparallel
    - unconvert
    - wrapcheck
    - wsl
  disable:
    - gochecknoglobals
 linters-settings:
  gosec:
    excludes:
      - G204
  tagliatelle:
    case:
      rules:
        yaml: snake
 issues:
  exclude-rules:
    - path: _test\.go
      linters:
        - gosec
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@ -0,0 +1,20 @@
 ---
 repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.4.0
    hooks:
      - id: check-added-large-files
      - id: check-yaml
        args:
          - --allow-multiple-documents
      - id: trailing-whitespace
      - id: end-of-file-fixer
      - id: check-merge-conflict
  - repo: https://github.com/golangci/golangci-lint
    rev: v1.52.2
    hooks:
      - id: golangci-lint
  - repo: https://github.com/hadolint/hadolint
    rev: v2.12.1-beta
    hooks:
      - id: hadolint
--- a/26
+++ b/26
@ -1,8 +1,24 @@
-ARG REPO=library
+FROM alpine:3.18
 FROM ${REPO}/busybox:latest
 WORKDIR /root/
-ARG ARCH=amd64
+RUN mkdir /app
-COPY ./minitor-go ./minitor
+WORKDIR /app/
 # Add common checking tools
 RUN apk --no-cache add bash=~5 curl=~8 jq=~1 bind-tools=~9 tzdata~=2024a
 # Add minitor user for running as non-root
 RUN addgroup -S minitor && adduser -S minitor -G minitor
 # Copy scripts
 COPY ./scripts /app/scripts
 RUN chmod -R 755 /app/scripts
 # Copy minitor in
 ARG TARGETOS
 ARG TARGETARCH
 COPY ./dist/minitor-${TARGETOS}-${TARGETARCH} ./minitor
 # Drop to non-root user
 USER minitor
 ENTRYPOINT [ "./minitor" ]
--- a/Dockerfile.multi-stage
+++ b/Dockerfile.multi-stage
@ -1,7 +1,4 @@
-ARG REPO=library
+FROM golang:1.20 AS builder
 FROM golang:1.12-alpine AS builder
 RUN apk add --no-cache git
 RUN mkdir /app
 WORKDIR /app
@ -11,13 +8,32 @@ RUN go mod download
 COPY ./*.go /app/
-ARG ARCH=amd64
+ARG TARGETOS
 ARG TARGETARCH
 ARG VERSION=dev
-ENV CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH}
+ENV CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=${TARGETARCH}
 RUN go build -ldflags "-X main.version=${VERSION}" -a -installsuffix nocgo -o minitor .
-FROM ${REPO}/busybox:latest
+FROM alpine:3.18
-WORKDIR /root/
+RUN mkdir /app
 WORKDIR /app/
 # Copy minitor in
 COPY --from=builder /app/minitor .
 # Add common checking tools
 RUN apk --no-cache add bash=~5 curl=~8 jq=~1 bind-tools=~9 tzdata~=2024a
 # Add minitor user for running as non-root
 RUN addgroup -S minitor && adduser -S minitor -G minitor
 # Copy scripts
 COPY ./scripts /app/scripts
 RUN chmod -R 755 /app/scripts
 # Drop to non-root user
 USER minitor
 ENTRYPOINT [ "./minitor" ]
 # vim: set filetype=dockerfile:
--- a/84
+++ b/84
@ -1,39 +1,95 @@
 DOCKER_TAG ?= minitor-go-${USER}
 VERSION ?= $(shell git describe --tags --dirty)
 GOFILES = *.go go.mod go.sum
 # Multi-arch targets are generated from this
 TARGET_ALIAS = minitor-linux-amd64 minitor-linux-arm minitor-linux-arm64 minitor-darwin-amd64
 TARGETS = $(addprefix dist/,$(TARGET_ALIAS))
 #
 # Default make target will run tests
 .DEFAULT_GOAL = test
-.PHONY: test
+# Build all static Minitor binaries
-default: test
+.PHONY: all
 all: $(TARGETS)
 # Build all static Linux Minitor binaries. Used in Docker images
 .PHONY: all-linux
 all-linux: $(filter dist/minitor-linux-%,$(TARGETS))
 # Build minitor for the current machine
 minitor: $(GOFILES)
 	@echo Version: $(VERSION)
 	go build -ldflags '-X "main.version=${VERSION}"' -o minitor
 .PHONY: build
-build:
+build: minitor
 	go build
 minitor-go:
 	go build
 # Run minitor for the current machine
 .PHONY: run
-run: minitor-go build
+run: minitor
-	./minitor-go -debug
+	./minitor -debug
 .PHONY: run-metrics
 run-metrics: minitor
 	./minitor -debug -metrics
 # Run all tests
 .PHONY: test
 test:
 	go test -coverprofile=coverage.out
 	@echo
 	go tool cover -func=coverage.out
 	@echo
 	@# Check min coverage percentage
 	@go tool cover -func=coverage.out | awk -v target=80.0% \
 		'/^total:/ { print "Total coverage: " $$3 " Minimum coverage: " target; if ($$3+0.0 >= target+0.0) print "ok"; else { print "fail"; exit 1; } }'
 # Installs pre-commit hooks
 .PHONY: install-hooks
 install-hooks:
 	pre-commit install --install-hooks
 # Runs pre-commit checks on files
 .PHONY: check
 check:
 	pre-commit run --all-files
 .PHONY: clean
 clean:
-	rm -f ./minitor-go
+	rm -f ./minitor
 	rm -f ./coverage.out
 	rm -fr ./dist
 .PHONY: docker-build
 docker-build:
-	docker build -f ./Dockerfile.multi-stage -t $(DOCKER_TAG) .
+	docker build -f ./Dockerfile.multi-stage -t $(DOCKER_TAG)-linux-amd64 .
 .PHONY: docker-run
 docker-run: docker-build
 	docker run --rm -v $(shell pwd)/config.yml:/root/config.yml $(DOCKER_TAG)
 ## Multi-arch targets
 $(TARGETS): $(GOFILES)
 	mkdir -p ./dist
 	GOOS=$(word 2, $(subst -, ,$(@))) GOARCH=$(word 3, $(subst -, ,$(@))) CGO_ENABLED=0 \
 		 go build -ldflags '-X "main.version=${VERSION}"' -a -installsuffix nocgo \
 		 -o $@
 .PHONY: $(TARGET_ALIAS)
 $(TARGET_ALIAS):
 	$(MAKE) $(addprefix dist/,$@)
 # Arch specific docker build targets
 .PHONY: docker-build-arm
 docker-build-arm: dist/minitor-linux-arm
 	docker build --platform linux/arm . -t ${DOCKER_TAG}-linux-arm
 .PHONY: docker-build-arm64
 docker-build-arm64: dist/minitor-linux-arm64
 	docker build  --platform linux/arm64 . -t ${DOCKER_TAG}-linux-arm64
 # Cross run on host architechture
 .PHONY: docker-run-arm
 docker-run-arm: docker-build-arm
 	docker run --rm -v /var/run/docker.sock:/var/run/docker.sock --name $(DOCKER_TAG)-run ${DOCKER_TAG}-linux-arm
 .PHONY: docker-run-arm64
 docker-run-arm64: docker-build-arm64
 	docker run --rm -v /var/run/docker.sock:/var/run/docker.sock --name $(DOCKER_TAG)-run ${DOCKER_TAG}-linux-arm64
--- a/README.md
+++ b/README.md
@ -1,97 +1,200 @@
-# minitor-go
+# [minitor-go](https://git.iamthefij.com/iamthefij/minitor-go)
-A reimplementation of [Minitor](https://git.iamthefij/iamthefij/minitor) in Go
+A minimal monitoring system
-Minitor is already a very minimal monitoring tool. Python 3 was a quick way to get something live, but Python itself comes with a very large footprint.Thus Go feels like a better fit for the project, longer term.
+## What does it do?
 Minitor accepts a YAML configuration file with a set of commands to run and a set of alerts to execute when those commands fail. It is designed to be as simple as possible and relies on other command line tools to do checks and issue alerts.
 ## But why?
 I'm running a few small services and found Sensu, Consul, Nagios, etc. to all be far too complicated for my usecase.
 ## So how do I use it?
 ### Running
 Install and execute with:
 ```bash
 go get github.com/iamthefij/minitor-go
 minitor
 ```
 If locally developing you can use:
 ```bash
 make run
 ```
 It will read the contents of `config.yml` and begin its loop. You could also run it directly and provide a new config file via the `-config` argument.
 #### Docker
 You can pull this repository directly from Docker:
 ```bash
 docker pull iamthefij/minitor-go:latest
 ```
 The Docker image uses a default `config.yml` that is copied from `sample-config.yml`. This won't really do anything for you, so when you run the Docker image, you should supply your own `config.yml` file:
 ```bash
 docker run -v $PWD/config.yml:/app/config.yml iamthefij/minitor-go:latest
 ```
 Images are provided for `amd64`, `arm`, and `arm64` architechtures.
 Timezone configuration for the container is set by passing the `TZ` env variable. Eg. `TZ=America/Los_Angeles`.
 ## Configuring
 In this repo, you can explore the `sample-config.yml` file for an example, but the general structure is as follows. It should be noted that environment variable interpolation happens on load of the YAML file.
 The global configurations are:
 |key|value|
 |---|---|
 |`check_interval`|Maximum frequency to run checks for each monitor as duration, eg. 1m2s.|
 |`default_alert_after`|A default value used as an `alert_after` value for a monitor if not specified or 0.|
 |`default_alert_down`|Default down alerts to used by a monitor in case none are provided.|
 |`default_alert_up`|Default up alerts to used by a monitor in case none are provided.|
 |`monitors`|List of all monitors. Detailed description below|
 |`alerts`|List of all alerts. Detailed description below|
 ### Monitors
 All monitors should be listed under `monitors`.
 Each monitor allows the following configuration:
 |key|value|
 |---|---|
 |`name`|Name of the monitor running. This will show up in messages and logs.|
 |`command`|Specifies the command that should be executed, either in exec or shell form. This command's exit value will determine whether the check is successful|
 |`alert_down`|A list of Alerts to be triggered when the monitor is in a "down" state|
 |`alert_up`|A list of Alerts to be triggered when the monitor moves to an "up" state|
 |`check_interval`|The interval at which this monitor should be checked. This must be greater than the global `check_interval` value|
 |`alert_after`|Allows specifying the number of failed checks before an alert should be triggered|
 |`alert_every`|Allows specifying how often an alert should be retriggered. There are a few magic numbers here. Defaults to `-1` for an exponential backoff. Setting to `0` disables re-alerting. Positive values will allow retriggering after the specified number of checks|
 ### Alerts
 Alerts exist as objects keyed under `alerts`. Their key should be the name of the Alert. This is used in your monitor setup in `alert_down` and `alert_up`.
 Eachy alert allows the following configuration:
 |key|value|
 |---|---|
 |`command`|Specifies the command that should be executed, either in exec or shell form. This is the command that will be run when the alert is executed. This can be templated with environment variables or the variables shown in the table below|
 Also, when alerts are executed, they will be passed through Go's format function with arguments for some attributes of the Monitor. The following monitor specific variables can be referenced using Go formatting syntax:
 |token|value|
 |---|---|
 |`{{.AlertCount}}`|Number of times this monitor has alerted|
 |`{{.FailureCount}}`|The total number of sequential failed checks for this monitor|
 |`{{.LastCheckOutput}}`|The last returned value from the check command to either stderr or stdout|
 |`{{.LastSuccess}}`|The datetime of the last successful check as a go Time struct|
 |`{{.MonitorName}}`|The name of the monitor that failed and triggered the alert|
 |`{{.IsUp}}`|Indicates if the monitor that is alerting is up or not. Can be used in a conditional message template|
 To provide flexible formatting, the following non-standard functions are available in templates:
 |func|description|
 |---|---|
 |`ANSIC <Time>`|Formats provided time in ANSIC format|
 |`UnixDate <Time>`|Formats provided time in UnixDate format|
 |`RubyDate <Time>`|Formats provided time in RubyDate format|
 |`RFC822Z <Time>`|Formats provided time in RFC822Z format|
 |`RFC850 <Time>`|Formats provided time in RFC850 format|
 |`RFC1123 <Time>`|Formats provided time in RFC1123 format|
 |`RFC1123Z <Time>`|Formats provided time in RFC1123Z format|
 |`RFC3339 <Time>`|Formats provided time in RFC3339 format|
 |`RFC3339Nano <Time>`|Formats provided time in RFC3339Nano format|
 |`FormatTime <Time> <string template>`|Formats provided time according to provided template|
 |`InTZ <Time> <string timezone name>`|Converts provided time to parsed timezone from the provided name|
 For more information, check out the [Go documentation for the time module](https://pkg.go.dev/time@go1.20.7#pkg-constants).
 #### Running alerts on startup
 It's not the best feeling to find out your alerts are broken when you're expecting to be alerted about another failure. To avoid this and provide early insight into broken alerts, it is possible to specify a list of alerts to run when Minitor starts up. This can be done using the command line flag `-startup-alerts`. This flag accepts a comma separated list of strings and will run a test of each of those alerts. Minitor will then respond as it typically does for any failed alert. This can be used to allow you time to correct when initially launching, and to allow schedulers to more easily detect a failed deployment of Minitor.
 Eg.
 ```bash
 minitor -startup-alerts=log_down,log_up -config ./config.yml
 ```
 ### Metrics
 Minitor supports exporting metrics for [Prometheus](https://prometheus.io/). Prometheus is an open source tool for reading and querying metrics from different sources. Combined with another tool, [Grafana](https://grafana.com/), it allows building of charts and dashboards. You could also opt to just use Minitor to log check results, and instead do your alerting with Grafana.
 It is also possible to use the metrics endpoint for monitoring Minitor itself! This allows setting up multiple instances of Minitor on different servers and have them monitor each-other so that you can detect a minitor outage.
 To run minitor with metrics, use the `-metrics` flag. The metrics will be served on port `8080` by default, though it can be overriden using `-metrics-port`. They will be accessible on the path `/metrics`. Eg. `localhost:8080/metrics`.
 ```bash
 minitor -metrics
 # or
 minitor -metrics -metrics-port 3000
 ```
 ## Contributing
 Whether you're looking to submit a patch or tell me I broke something, you can contribute through the Github mirror and I can merge PRs back to the source repository.
 Primary Repo: https://git.iamthefij.com/iamthefij/minitor.git
 Github Mirror: https://github.com/IamTheFij/minitor.git
 ## Original Minitor
 This is a reimplementation of [Minitor](https://git.iamthefij.com/iamthefij/minitor) in Go
 Minitor is already a minimal monitoring tool. Python 3 was a quick way to get something live, but Python itself comes with a large footprint. Thus Go feels like a better fit for the project, longer term.
 Initial target is meant to be roughly compatible requiring only minor changes to configuration. Future iterations may diverge to take advantage of Go specific features.
-## Differences from Python version
+### Differences from Python version
-There are a few key differences between the Python version and the v0.x Go version.
+Templating for Alert messages has been updated. In the Python version, `str.format(...)` was used with certain keys passed in that could be used to format messages. In the Go version, we use a struct, `AlertNotice` defined in `alert.go` and the built in Go templating format. Eg.
 First, configuration keys cannot have multiple types in Go, so a different key must be used when specifying a Shell command as a string rather than a list of args. Instead of `command`, you must use `command_shell`. Eg:
 minitor-py:
 ```yaml
 monitors:
  - name: Exec command
    command: ['echo', 'test']
  - name: Shell command
    command: echo 'test'
 ```
 minitor-go:
 ```yaml
 monitors:
  - name: Exec command
    command: ['echo', 'test']
  - name: Shell command
    command_shell: echo 'test'
 ```
 Second, templating for Alert messages has been updated. In the Python version, `str.format(...)` was used with certain keys passed in that could be used to format messages. In the Go version, we use a struct containing Alert info and the built in Go templating format. Eg.
 minitor-py:
 ```yaml
 alerts:
-  log_command:
+  log:
-    command: ['echo', '{monitor_name}']
+    command: 'echo {monitor_name}'
  log_shell:
    command_shell: "echo {monitor_name}"
 ```
 minitor-go:
 ```yaml
 alerts:
-  log_command:
+  log:
-    command: ['echo', '{{.MonitorName}}']
+    command: 'echo {{.MonitorName}}'
  log_shell:
    command_shell: "echo {{.MonitorName}}"
 ```
-Finally, newlines in a shell command don't terminate a particular command. Semicolons must be used and continuations should not.
+Interval durations have changed from being an integer number of seconds to a duration string supported by Go, for example:
 minitor-py:
 ```yaml
-alerts:
+check_interval: 90
  log_shell:
    command_shell: >
      echo "line 1"
      echo "line 2"
      echo "continued" \
        "line"
 ```
 minitor-go:
 ```yaml
-alerts:
+check_interval: 1m30s
  log_shell:
    command_shell: >
      echo "line 1";
      echo "line 2";
      echo "continued"
        "line"
 ```
-## To do
+For the time being, legacy configs for the Python version of Minitor should be compatible if you apply the `-py-compat` flag when running Minitor. Eventually, this flag will go away when later breaking changes are introduced.
 There are two sets of task lists. The first is to get rough parity on key features with the Python version. The second is to make some improvements to the framework.
-Pairity:
+## Future
-  - [x] Run monitor commands
+Future, potentially breaking changes
  - [x] Run monitor commands in a shell
  - [x] Run alert commands
  - [x] Run alert commands in a shell
  - [x] Allow templating of alert commands
  - [ ] Implement Prometheus client to export metrics
  - [ ] Test coverage
 Improvement:
  - [ ] Implement leveled logging (maybe glog or logrus)
  - [ ] Consider switching from YAML to TOML
  - [ ] Consider value of templating vs injecting values into Env variables
  - [ ] Consider dropping `alert_up` and `alert_down` in favor of using Go templates that offer more control of messaging
  - [ ] Async checking
-  - [ ] Use durations rather than seconds checked in event loop
+  - [ ] Revisit metrics and see if they all make sense
  - [ ] Consider dropping `alert_up` and `alert_down` in favor of using Go templates that offer more control of messaging (Breaking)
--- a/alert.go
+++ b/alert.go
@ -2,89 +2,157 @@ package main
 import (
 	"bytes"
 	"errors"
 	"fmt"
 	"log"
 	"os/exec"
 	"strings"
 	"text/template"
 	"time"
 	"git.iamthefij.com/iamthefij/slog"
 )
 var (
 	errNoTemplate = errors.New("no template")
 	// ErrAlertFailed indicates that an alert failed to send
 	ErrAlertFailed = errors.New("alert failed")
 )
 // Alert is a config driven mechanism for sending a notice
 type Alert struct {
 	Name                 string
-	Command              []string
+	Command              CommandOrShell
 	CommandShell         string `yaml:"command_shell"`
 	commandTemplate      []*template.Template
 	commandShellTemplate *template.Template
 }
 // AlertNotice captures the context for an alert to be sent
 type AlertNotice struct {
 	MonitorName     string
 	AlertCount      int16
 	FailureCount    int16
 	LastCheckOutput string
 	LastSuccess     time.Time
 	IsUp            bool
 	LastSuccess     time.Time
 	MonitorName     string
 	LastCheckOutput string
 }
 // IsValid returns a boolean indicating if the Alert has been correctly
 // configured
 func (alert Alert) IsValid() bool {
-	atLeastOneCommand := (alert.CommandShell != "" || alert.Command != nil)
+	return !alert.Command.Empty()
 	atMostOneCommand := (alert.CommandShell == "" || alert.Command == nil)
 	return atLeastOneCommand && atMostOneCommand
 }
 // BuildTemplates compiles command templates for the Alert
 func (alert *Alert) BuildTemplates() error {
-	if LogDebug {
+	// TODO: Remove legacy template support later after 1.0
-		log.Printf("DEBUG: Building template for alert %s", alert.Name)
+	legacy := strings.NewReplacer(
 		"{alert_count}", "{{.AlertCount}}",
 		"{alert_message}", "{{.MonitorName}} check has failed {{.FailureCount}} times",
 		"{failure_count}", "{{.FailureCount}}",
 		"{last_output}", "{{.LastCheckOutput}}",
 		"{last_success}", "{{.LastSuccess}}",
 		"{monitor_name}", "{{.MonitorName}}",
 	)
 	slog.Debugf("Building template for alert %s", alert.Name)
 	// Time format func factory
 	tff := func(formatString string) func(time.Time) string {
 		return func(t time.Time) string {
 			return t.Format(formatString)
 		}
-	if alert.commandTemplate == nil && alert.Command != nil {
+	}
 	// Create some functions for formatting datetimes in popular formats
 	timeFormatFuncs := template.FuncMap{
 		"ANSIC":       tff(time.ANSIC),
 		"UnixDate":    tff(time.UnixDate),
 		"RubyDate":    tff(time.RubyDate),
 		"RFC822Z":     tff(time.RFC822Z),
 		"RFC850":      tff(time.RFC850),
 		"RFC1123":     tff(time.RFC1123),
 		"RFC1123Z":    tff(time.RFC1123Z),
 		"RFC3339":     tff(time.RFC3339),
 		"RFC3339Nano": tff(time.RFC3339Nano),
 		"FormatTime": func(t time.Time, timeFormat string) string {
 			return t.Format(timeFormat)
 		},
 		"InTZ": func(t time.Time, tzName string) (time.Time, error) {
 			tz, err := time.LoadLocation(tzName)
 			if err != nil {
 				return t, fmt.Errorf("failed to convert time to specified tz: %w", err)
 			}
 			return t.In(tz), nil
 		},
 	}
 	switch {
 	case alert.commandTemplate == nil && alert.Command.Command != nil:
 		alert.commandTemplate = []*template.Template{}
-		for i, cmdPart := range alert.Command {
+		for i, cmdPart := range alert.Command.Command {
 			if PyCompat {
 				cmdPart = legacy.Replace(cmdPart)
 			}
 			alert.commandTemplate = append(alert.commandTemplate, template.Must(
-				template.New(alert.Name+string(i)).Parse(cmdPart),
+				template.New(alert.Name+fmt.Sprint(i)).Funcs(timeFormatFuncs).Parse(cmdPart),
 			))
 		}
-	} else if alert.commandShellTemplate == nil && alert.CommandShell != "" {
+	case alert.commandShellTemplate == nil && alert.Command.ShellCommand != "":
 		shellCmd := alert.Command.ShellCommand
 		if PyCompat {
 			shellCmd = legacy.Replace(shellCmd)
 		}
 		alert.commandShellTemplate = template.Must(
-			template.New(alert.Name).Parse(alert.CommandShell),
+			template.New(alert.Name).Funcs(timeFormatFuncs).Parse(shellCmd),
 		)
-	} else {
+	default:
-		return fmt.Errorf("No template provided for alert %s", alert.Name)
+		return fmt.Errorf("No template provided for alert %s: %w", alert.Name, errNoTemplate)
 	}
 	return nil
 }
 // Send will send an alert notice by executing the command template
-func (alert Alert) Send(notice AlertNotice) (output_str string, err error) {
+func (alert Alert) Send(notice AlertNotice) (outputStr string, err error) {
-	log.Printf("INFO: Sending alert %s for %s", alert.Name, notice.MonitorName)
+	slog.Infof("Sending alert %s for %s", alert.Name, notice.MonitorName)
 	var cmd *exec.Cmd
-	if alert.commandTemplate != nil {
+
 	switch {
 	case alert.commandTemplate != nil:
 		command := []string{}
 		for _, cmdTmp := range alert.commandTemplate {
 			var commandBuffer bytes.Buffer
 			err = cmdTmp.Execute(&commandBuffer, notice)
 			if err != nil {
 				return
 			}
 			command = append(command, commandBuffer.String())
 		}
 		cmd = exec.Command(command[0], command[1:]...)
-	} else if alert.commandShellTemplate != nil {
+	case alert.commandShellTemplate != nil:
 		var commandBuffer bytes.Buffer
 		err = alert.commandShellTemplate.Execute(&commandBuffer, notice)
 		if err != nil {
 			return
 		}
 		shellCommand := commandBuffer.String()
 		cmd = ShellCommand(shellCommand)
-	} else {
+	default:
-		err = fmt.Errorf("No templates compiled for alert %v", alert.Name)
+		err = fmt.Errorf("No templates compiled for alert %s: %w", alert.Name, errNoTemplate)
 		return
 	}
@ -95,10 +163,30 @@ func (alert Alert) Send(notice AlertNotice) (output_str string, err error) {
 	var output []byte
 	output, err = cmd.CombinedOutput()
-	output_str = string(output)
+	outputStr = string(output)
-	if LogDebug {
+	slog.Debugf("Alert output for: %s\n---\n%s\n---", alert.Name, outputStr)
-		log.Printf("DEBUG: Alert output for: %s\n---\n%s\n---", alert.Name, output_str)
+
 	if err != nil {
 		err = fmt.Errorf(
 			"Alert %s failed to send. Returned %w: %w",
 			alert.Name,
 			err,
 			ErrAlertFailed,
 		)
 	}
-	return output_str, err
+	return outputStr, err
 }
 // NewLogAlert creates an alert that does basic logging using echo
 func NewLogAlert() *Alert {
 	return &Alert{
 		Name: "log",
 		Command: CommandOrShell{
 			Command: []string{
 				"echo",
 				"{{.MonitorName}} {{if .IsUp}}has recovered{{else}}check has failed {{.FailureCount}} times{{end}}",
 			},
 		},
 	}
 }
--- a/alert_test.go
+++ b/alert_test.go
@ -11,23 +11,20 @@ func TestAlertIsValid(t *testing.T) {
 		expected bool
 		name     string
 	}{
-		{Alert{Command: []string{"echo", "test"}}, true, "Command only"},
+		{Alert{Command: CommandOrShell{Command: []string{"echo", "test"}}}, true, "Command only"},
-		{Alert{CommandShell: "echo test"}, true, "CommandShell only"},
+		{Alert{Command: CommandOrShell{ShellCommand: "echo test"}}, true, "CommandShell only"},
 		{Alert{}, false, "No commands"},
 		{
 			Alert{Command: []string{"echo", "test"}, CommandShell: "echo test"},
 			false,
 			"Both commands",
 		},
 	}
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		actual := c.alert.IsValid()
 		if actual != c.expected {
 			t.Errorf("IsValid(%v), expected=%t actual=%t", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -39,50 +36,94 @@ func TestAlertSend(t *testing.T) {
 		expectedOutput string
 		expectErr      bool
 		name           string
 		pyCompat       bool
 	}{
 		{
-			Alert{Command: []string{"echo", "{{.MonitorName}}"}},
+			Alert{Command: CommandOrShell{Command: []string{"echo", "{{.MonitorName}}"}}},
 			AlertNotice{MonitorName: "test"},
 			"test\n",
 			false,
 			"Command with template",
 			false,
 		},
 		{
-			Alert{CommandShell: "echo {{.MonitorName}}"},
+			Alert{Command: CommandOrShell{ShellCommand: "echo {{.MonitorName}}"}},
 			AlertNotice{MonitorName: "test"},
 			"test\n",
 			false,
 			"Command shell with template",
 			false,
 		},
 		{
-			Alert{Command: []string{"echo", "{{.Bad}}"}},
+			Alert{Command: CommandOrShell{Command: []string{"echo", "{{.Bad}}"}}},
 			AlertNotice{MonitorName: "test"},
 			"",
 			true,
 			"Command with bad template",
 			false,
 		},
 		{
-			Alert{CommandShell: "echo {{.Bad}}"},
+			Alert{Command: CommandOrShell{ShellCommand: "echo {{.Bad}}"}},
 			AlertNotice{MonitorName: "test"},
 			"",
 			true,
 			"Command shell with bad template",
 			false,
 		},
 		{
 			Alert{Command: CommandOrShell{ShellCommand: "echo {alert_message}"}},
 			AlertNotice{MonitorName: "test", FailureCount: 1},
 			"test check has failed 1 times\n",
 			false,
 			"Command shell with legacy template",
 			true,
 		},
 		// Test default log alert down
 		{
 			*NewLogAlert(),
 			AlertNotice{MonitorName: "Test", FailureCount: 1, IsUp: false},
 			"Test check has failed 1 times\n",
 			false,
 			"Default log alert down",
 			false,
 		},
 		// Test default log alert up
 		{
 			*NewLogAlert(),
 			AlertNotice{MonitorName: "Test", IsUp: true},
 			"Test has recovered\n",
 			false,
 			"Default log alert up",
 			false,
 		},
 	}
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
-		c.alert.BuildTemplates()
+		// Set PyCompat to value of compat flag
 		PyCompat = c.pyCompat
 		err := c.alert.BuildTemplates()
 		if err != nil {
 			t.Errorf("Send(%v output), error building templates: %v", c.name, err)
 		}
 		output, err := c.alert.Send(c.notice)
 		hasErr := (err != nil)
 		if output != c.expectedOutput {
 			t.Errorf("Send(%v output), expected=%v actual=%v", c.name, c.expectedOutput, output)
 			log.Printf("Case failed: %s", c.name)
 		}
 		if hasErr != c.expectErr {
 			t.Errorf("Send(%v err), expected=%v actual=%v", c.name, "Err", err)
 			log.Printf("Case failed: %s", c.name)
 		}
 		// Set PyCompat back to default value
 		PyCompat = false
 		log.Println("-----")
 	}
 }
@ -90,10 +131,12 @@ func TestAlertSend(t *testing.T) {
 func TestAlertSendNoTemplates(t *testing.T) {
 	alert := Alert{}
 	notice := AlertNotice{}
 	output, err := alert.Send(notice)
 	if err == nil {
 		t.Errorf("Send(no template), expected=%v actual=%v", "Err", output)
 	}
 	log.Println("-----")
 }
@ -103,8 +146,8 @@ func TestAlertBuildTemplate(t *testing.T) {
 		expectErr bool
 		name      string
 	}{
-		{Alert{Command: []string{"echo", "test"}}, false, "Command only"},
+		{Alert{Command: CommandOrShell{Command: []string{"echo", "test"}}}, false, "Command only"},
-		{Alert{CommandShell: "echo test"}, false, "CommandShell only"},
+		{Alert{Command: CommandOrShell{ShellCommand: "echo test"}}, false, "CommandShell only"},
 		{Alert{}, true, "No commands"},
 	}
@ -112,10 +155,12 @@ func TestAlertBuildTemplate(t *testing.T) {
 		log.Printf("Testing case %s", c.name)
 		err := c.alert.BuildTemplates()
 		hasErr := (err != nil)
 		if hasErr != c.expectErr {
 			t.Errorf("IsValid(%v), expected=%t actual=%t", c.name, c.expectErr, err)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
--- a/config.go
+++ b/config.go
@ -2,66 +2,164 @@ package main
 import (
 	"errors"
 	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"log"
 	"os"
 	"time"
 	"git.iamthefij.com/iamthefij/slog"
 	"gopkg.in/yaml.v2"
 )
 var errInvalidConfig = errors.New("Invalid configuration")
 // Config type is contains all provided user configuration
 type Config struct {
-	CheckInterval int64 `yaml:"check_interval"`
+	CheckInterval     SecondsOrDuration `yaml:"check_interval"`
 	DefaultAlertAfter int16             `yaml:"default_alert_after"`
 	DefaultAlertEvery *int16            `yaml:"default_alert_every"`
 	DefaultAlertDown  []string          `yaml:"default_alert_down"`
 	DefaultAlertUp    []string          `yaml:"default_alert_up"`
 	Monitors          []*Monitor
 	Alerts            map[string]*Alert
 }
 // CommandOrShell type wraps a string or list of strings
 // for executing a command directly or in a shell
 type CommandOrShell struct {
 	ShellCommand string
 	Command      []string
 }
 // Empty checks if the Command has a value
 func (cos CommandOrShell) Empty() bool {
 	return (cos.ShellCommand == "" && cos.Command == nil)
 }
 // UnmarshalYAML allows unmarshalling either a string or slice of strings
 // and parsing them as either a command or a shell command.
 func (cos *CommandOrShell) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	var cmd []string
 	err := unmarshal(&cmd)
 	// Error indicates this is shell command
 	if err != nil {
 		var shellCmd string
 		err := unmarshal(&shellCmd)
 		if err != nil {
 			return err
 		}
 		cos.ShellCommand = shellCmd
 	} else {
 		cos.Command = cmd
 	}
 	return nil
 }
 // SecondsOrDuration wraps a duration value for parsing a duration or seconds from YAML
 // NOTE: This should be removed in favor of only parsing durations once compatibility is broken
 type SecondsOrDuration struct {
 	value time.Duration
 }
 // Value returns a duration value
 func (sod SecondsOrDuration) Value() time.Duration {
 	return sod.value
 }
 // UnmarshalYAML allows unmarshalling a duration value or seconds if an int was provided
 func (sod *SecondsOrDuration) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	var seconds int64
 	err := unmarshal(&seconds)
 	if err == nil {
 		sod.value = time.Second * time.Duration(seconds)
 		return nil
 	}
 	// Error indicates that we don't have an int
 	err = unmarshal(&sod.value)
 	return err
 }
 // IsValid checks config validity and returns true if valid
 func (config Config) IsValid() (isValid bool) {
 	isValid = true
-	// Validate monitors
+	// Validate alerts
-	if config.Monitors == nil || len(config.Monitors) == 0 {
+	if config.Alerts == nil || len(config.Alerts) == 0 {
-		log.Printf("ERROR: Invalid monitor configuration: Must provide at least one monitor")
+		// This should never happen because there is a default alert named 'log' for now
 		slog.Errorf("Invalid alert configuration: Must provide at least one alert")
 		isValid = false
 	}
 	for _, alert := range config.Alerts {
 		if !alert.IsValid() {
 			slog.Errorf("Invalid alert configuration: %+v", alert.Name)
 			isValid = false
 		} else {
 			slog.Debugf("Loaded alert %s", alert.Name)
 		}
 	}
 	// Validate monitors
 	if config.Monitors == nil || len(config.Monitors) == 0 {
 		slog.Errorf("Invalid monitor configuration: Must provide at least one monitor")
 		isValid = false
 	}
 	for _, monitor := range config.Monitors {
 		if !monitor.IsValid() {
-			log.Printf("ERROR: Invalid monitor configuration: %s", monitor.Name)
+			slog.Errorf("Invalid monitor configuration: %s", monitor.Name)
 			isValid = false
 		}
 		// Check that all Monitor alerts actually exist
 		for _, isUp := range []bool{true, false} {
 			for _, alertName := range monitor.GetAlertNames(isUp) {
 				if _, ok := config.Alerts[alertName]; !ok {
-					log.Printf(
+					slog.Errorf(
-						"ERROR: Invalid monitor configuration: %s. Unknown alert %s",
+						"Invalid monitor configuration: %s. Unknown alert %s",
 						monitor.Name, alertName,
 					)
 					isValid = false
 				}
 			}
 		}
 	}
-	// Validate alerts
+	return isValid
 	if config.Alerts == nil || len(config.Alerts) == 0 {
 		log.Printf("ERROR: Invalid alert configuration: Must provide at least one alert")
 		isValid = false
 	}
 	for _, alert := range config.Alerts {
 		if !alert.IsValid() {
 			log.Printf("ERROR: Invalid alert configuration: %s", alert.Name)
 			isValid = false
 		}
 	}
 	return
 }
 // Init performs extra initialization on top of loading the config from file
 func (config *Config) Init() (err error) {
 	for _, monitor := range config.Monitors {
 		if monitor.AlertAfter == 0 && config.DefaultAlertAfter > 0 {
 			monitor.AlertAfter = config.DefaultAlertAfter
 		}
 		if monitor.AlertEvery == nil && config.DefaultAlertEvery != nil {
 			monitor.AlertEvery = config.DefaultAlertEvery
 		}
 		if len(monitor.AlertDown) == 0 && len(config.DefaultAlertDown) > 0 {
 			monitor.AlertDown = config.DefaultAlertDown
 		}
 		if len(monitor.AlertUp) == 0 && len(config.DefaultAlertUp) > 0 {
 			monitor.AlertUp = config.DefaultAlertUp
 		}
 	}
 	for name, alert := range config.Alerts {
 		alert.Name = name
 		if err = alert.BuildTemplates(); err != nil {
 			return
 		}
@ -72,27 +170,40 @@ func (config *Config) Init() (err error) {
 // LoadConfig will read config from the given path and parse it
 func LoadConfig(filePath string) (config Config, err error) {
-	data, err := ioutil.ReadFile(filePath)
+	data, err := os.ReadFile(filePath)
 	if err != nil {
 		return
 	}
-	// TODO: Decide if this is better expanded here, or only when executing
+	err = yaml.Unmarshal(data, &config)
 	envExpanded := os.ExpandEnv(string(data))
 	err = yaml.Unmarshal([]byte(envExpanded), &config)
 	if err != nil {
 		return
 	}
-	log.Printf("config:\n%v\n", config)
+	slog.Debugf("Config values:\n%v\n", config)
-	if !config.IsValid() {
+	// Add log alert if not present
-		err = errors.New("Invalid configuration")
+	if PyCompat {
-		return
+		// Initialize alerts list if not present
 		if config.Alerts == nil {
 			config.Alerts = map[string]*Alert{}
 		}
 		if _, ok := config.Alerts["log"]; !ok {
 			config.Alerts["log"] = NewLogAlert()
 		}
 	}
 	// Finish initializing configuration
-	err = config.Init()
+	if err = config.Init(); err != nil {
 		return
 	}
 	if !config.IsValid() {
 		err = errInvalidConfig
 		return
 	}
 	return config, err
 }
--- a/config_test.go
+++ b/config_test.go
@ -3,6 +3,7 @@ package main
 import (
 	"log"
 	"testing"
 	"time"
 )
 func TestLoadConfig(t *testing.T) {
@ -10,22 +11,134 @@ func TestLoadConfig(t *testing.T) {
 		configPath string
 		expectErr  bool
 		name       string
 		pyCompat   bool
 	}{
-		{"./test/valid-config.yml", false, "Valid config file"},
+		{"./test/valid-config.yml", false, "Valid config file", false},
-		{"./test/does-not-exist", true, "Invalid config path"},
+		{"./test/valid-config-default-values.yml", false, "Valid config file with default values", false},
-		{"./test/invalid-config-type.yml", true, "Invalid config type for key"},
+		{"./test/valid-default-log-alert.yml", false, "Valid config file with default log alert PyCompat", true},
-		{"./test/invalid-config-missing-alerts.yml", true, "Invalid config missing alerts"},
+		{"./test/valid-default-log-alert.yml", true, "Invalid config file no log alert", false},
-		{"./test/invalid-config-unknown-alert.yml", true, "Invalid config unknown alert"},
+		{"./test/does-not-exist", true, "Invalid config path", false},
 		{"./test/invalid-config-type.yml", true, "Invalid config type for key", false},
 		{"./test/invalid-config-missing-alerts.yml", true, "Invalid config missing alerts", false},
 		{"./test/invalid-config-unknown-alert.yml", true, "Invalid config unknown alert", false},
 	}
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		// Set PyCompat based on compatibility mode
 		PyCompat = c.pyCompat
 		_, err := LoadConfig(c.configPath)
 		hasErr := (err != nil)
 		if hasErr != c.expectErr {
-			t.Errorf("LoadConfig(%v), expected=%v actual=%v", c.name, "Err", err)
+			t.Errorf("LoadConfig(%v), expected_error=%v actual=%v", c.name, c.expectErr, err)
 			log.Printf("Case failed: %s", c.name)
 		}
 		// Set PyCompat to default value
 		PyCompat = false
 	}
 }
 func TestIntervalParsing(t *testing.T) {
 	log.Printf("Testing case TestIntervalParsing")
 	config, err := LoadConfig("./test/valid-config.yml")
 	if err != nil {
 		t.Errorf("Failed loading config: %v", err)
 	}
 	oneSecond := time.Second
 	tenSeconds := 10 * time.Second
 	oneMinute := time.Minute
 	// validate top level interval seconds represented as an int
 	if config.CheckInterval.Value() != oneSecond {
 		t.Errorf("Incorrectly parsed int seconds. expected=%v actual=%v", oneSecond, config.CheckInterval)
 	}
 	if config.Monitors[0].CheckInterval.Value() != tenSeconds {
 		t.Errorf("Incorrectly parsed seconds duration. expected=%v actual=%v", oneSecond, config.CheckInterval)
 	}
 	if config.Monitors[1].CheckInterval.Value() != oneMinute {
 		t.Errorf("Incorrectly parsed seconds duration. expected=%v actual=%v", oneSecond, config.CheckInterval)
 	}
 	log.Println("-----")
 }
 // TestMultiLineConfig is a more complicated test stepping through the parsing
 // and execution of mutli-line strings presented in YAML
 func TestMultiLineConfig(t *testing.T) {
 	log.Println("Testing multi-line string config")
 	config, err := LoadConfig("./test/valid-verify-multi-line.yml")
 	if err != nil {
 		t.Fatalf("TestMultiLineConfig(load), expected=no_error actual=%v", err)
 	}
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(parse > string)")
 	expected := "echo 'Some string with stuff'; echo \"<angle brackets>\"; exit 1\n"
 	actual := config.Monitors[0].Command.ShellCommand
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(>) failed")
 		t.Logf("string expected=`%v`", expected)
 		t.Logf("string actual  =`%v`", actual)
 		t.Logf("bytes expected=%v", []byte(expected))
 		t.Logf("bytes actual  =%v", []byte(actual))
 	}
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(execute > string)")
 	_, notice := config.Monitors[0].Check()
 	if notice == nil {
 		t.Fatalf("Did not receive an alert notice")
 	}
 	expected = "Some string with stuff\n<angle brackets>\n"
 	actual = notice.LastCheckOutput
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(execute > string) check failed")
 		t.Logf("string expected=`%v`", expected)
 		t.Logf("string actual  =`%v`", actual)
 		t.Logf("bytes expected=%v", []byte(expected))
 		t.Logf("bytes actual  =%v", []byte(actual))
 	}
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(parse | string)")
 	expected = "echo 'Some string with stuff'\necho '<angle brackets>'\n"
 	actual = config.Alerts["log_shell"].Command.ShellCommand
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(|) failed")
 		t.Logf("string expected=`%v`", expected)
 		t.Logf("string actual  =`%v`", actual)
 		t.Logf("bytes expected=%v", []byte(expected))
 		t.Logf("bytes actual  =%v", []byte(actual))
 	}
 	log.Println("-----")
 	log.Println("TestMultiLineConfig(execute | string)")
 	actual, err = config.Alerts["log_shell"].Send(AlertNotice{})
 	if err != nil {
 		t.Errorf("Execution of alert failed")
 	}
 	expected = "Some string with stuff\n<angle brackets>\n"
 	if expected != actual {
 		t.Errorf("TestMultiLineConfig(execute | string) check failed")
 		t.Logf("string expected=`%v`", expected)
 		t.Logf("string actual  =`%v`", actual)
 		t.Logf("bytes expected=%v", []byte(expected))
 		t.Logf("bytes actual  =%v", []byte(actual))
 	}
 }
--- a/go.mod
+++ b/go.mod
@ -1,5 +1,23 @@
 module git.iamthefij.com/iamthefij/minitor-go
-go 1.12
+go 1.20
-require gopkg.in/yaml.v2 v2.2.4
+require (
 	git.iamthefij.com/iamthefij/slog v1.3.0
 	github.com/prometheus/client_golang v1.19.0
 	gopkg.in/yaml.v2 v2.4.0
 )
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.48.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
 	github.com/rogpeppe/go-internal v1.10.0 // indirect
 	golang.org/x/sys v0.16.0 // indirect
 	google.golang.org/protobuf v1.33.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,3 +1,546 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
 cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
 cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
 cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
 cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
 cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
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 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
 google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
 google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
 google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
--- a/main.go
+++ b/main.go
@ -1,61 +1,90 @@
 package main
 import (
 	"errors"
 	"flag"
 	"fmt"
-	"log"
+	"strings"
 	"time"
 	"git.iamthefij.com/iamthefij/slog"
 )
 var (
-	// LogDebug will control whether debug messsages should be logged
+	// ExportMetrics will track whether or not we want to export metrics to prometheus
-	LogDebug = false
+	ExportMetrics = false
 	// MetricsPort is the port to expose metrics on
 	MetricsPort = 8080
 	// Metrics contains all active metrics
 	Metrics = NewMetrics()
 	// PyCompat enables support for legacy Python templates
 	PyCompat = false
 	// version of minitor being run
 	version = "dev"
 	errUnknownAlert = errors.New("unknown alert")
 )
-func checkMonitors(config *Config) error {
+func sendAlerts(config *Config, monitor *Monitor, alertNotice *AlertNotice) error {
-	for _, monitor := range config.Monitors {
+	slog.Debugf("Received an alert notice from %s", alertNotice.MonitorName)
 		if monitor.ShouldCheck() {
 			_, alertNotice := monitor.Check()
 			// Should probably consider refactoring everything below here
 			if alertNotice != nil {
 				if LogDebug {
 					log.Printf("DEBUG: Recieved an alert notice from %s", alertNotice.MonitorName)
 				}
 	alertNames := monitor.GetAlertNames(alertNotice.IsUp)
 	if alertNames == nil {
 		// This should only happen for a recovery alert. AlertDown is validated not empty
-					log.Printf(
+		slog.Warningf(
-						"WARNING: Recieved alert, but no alert mechanisms exist. MonitorName=%s IsUp=%t",
+			"Received alert, but no alert mechanisms exist. MonitorName=%s IsUp=%t",
 			alertNotice.MonitorName, alertNotice.IsUp,
 		)
 		return nil
 	}
 	for _, alertName := range alertNames {
 		if alert, ok := config.Alerts[alertName]; ok {
 			output, err := alert.Send(*alertNotice)
 			if err != nil {
-							log.Printf(
+				slog.Errorf(
-								"ERROR: Alert '%s' failed. result=%v: output=%s",
+					"Alert '%s' failed. result=%v: output=%s",
 					alert.Name,
 					err,
 					output,
 				)
-							return fmt.Errorf(
+
-								"Unsuccessfully triggered alert '%s'. "+
+				return err
 									"Crashing to avoid false negatives: %v",
 								alert.Name,
 								err,
 							)
 			}
 			// Count alert metrics
 			Metrics.CountAlert(monitor.Name, alert.Name)
 		} else {
 			// This case should never actually happen since we validate against it
-						log.Printf("ERROR: Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
+			slog.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
-						return fmt.Errorf("Unknown alert for monitor %s: %s", alertNotice.MonitorName, alertName)
+
 			return fmt.Errorf("unknown alert for monitor %s: %s: %w", alertNotice.MonitorName, alertName, errUnknownAlert)
 		}
 	}
 	return nil
 }
 func checkMonitors(config *Config) error {
 	// TODO: Run this in goroutines and capture exceptions
 	for _, monitor := range config.Monitors {
 		if monitor.ShouldCheck() {
 			success, alertNotice := monitor.Check()
 			hasAlert := alertNotice != nil
 			// Track status metrics
 			Metrics.SetMonitorStatus(monitor.Name, monitor.IsUp())
 			Metrics.CountCheck(monitor.Name, success, monitor.LastCheckMilliseconds(), hasAlert)
 			if alertNotice != nil {
 				err := sendAlerts(config, monitor, alertNotice)
 				// If there was an error in sending an alert, exit early and bubble it up
 				if err != nil {
 					return err
 				}
 			}
 		}
 	}
@ -63,32 +92,80 @@ func checkMonitors(config *Config) error {
 	return nil
 }
 func sendStartupAlerts(config *Config, alertNames []string) error {
 	for _, alertName := range alertNames {
 		var err error
 		alert, ok := config.Alerts[alertName]
 		if !ok {
 			err = fmt.Errorf("unknown alert %s: %w", alertName, errUnknownAlert)
 		}
 		if err == nil {
 			_, err = alert.Send(AlertNotice{
 				AlertCount:      0,
 				FailureCount:    0,
 				IsUp:            true,
 				LastSuccess:     time.Now(),
 				MonitorName:     fmt.Sprintf("First Run Alert Test: %s", alert.Name),
 				LastCheckOutput: "",
 			})
 		}
 		if err != nil {
 			return err
 		}
 	}
 	return nil
 }
 func main() {
-	// Get debug flag
+	showVersion := flag.Bool("version", false, "Display the version of minitor and exit")
-	flag.BoolVar(&LogDebug, "debug", false, "Enables debug logs (default: false)")
+	configPath := flag.String("config", "config.yml", "Alternate configuration path (default: config.yml)")
-	var showVersion = flag.Bool("version", false, "Display the version of minitor and exit")
+	startupAlerts := flag.String("startup-alerts", "", "List of alerts to run on startup. This can help determine unhealthy alerts early on. (default \"\")")
 	flag.BoolVar(&slog.DebugLevel, "debug", false, "Enables debug logs (default: false)")
 	flag.BoolVar(&ExportMetrics, "metrics", false, "Enables prometheus metrics exporting (default: false)")
 	flag.BoolVar(&PyCompat, "py-compat", false, "Enables support for legacy Python Minitor config. Will eventually be removed. (default: false)")
 	flag.IntVar(&MetricsPort, "metrics-port", MetricsPort, "The port that Prometheus metrics should be exported on, if enabled. (default: 8080)")
 	flag.Parse()
 	// Print version if flag is provided
 	if *showVersion {
 		fmt.Println("Minitor version:", version)
 		return
 	}
 	if PyCompat {
 		slog.Warningf("Python compatibility mode is enabled. This will be removed in the next major release. Please update your configuration.")
 	}
 	// Load configuration
-	config, err := LoadConfig("config.yml")
+	config, err := LoadConfig(*configPath)
-	if err != nil {
+	slog.OnErrFatalf(err, "Error loading config: %v", err)
-		log.Fatalf("Error loading config: %v", err)
+
 	// Serve metrics exporter, if specified
 	if ExportMetrics {
 		slog.Infof("Exporting metrics to Prometheus on port %d", MetricsPort)
 		go ServeMetrics()
 	}
 	if *startupAlerts != "" {
 		alertNames := strings.Split(*startupAlerts, ",")
 		err = sendStartupAlerts(&config, alertNames)
 		slog.OnErrPanicf(err, "Error running startup alerts")
 	}
 	// Start main loop
 	for {
 		err = checkMonitors(&config)
-		if err != nil {
+		slog.OnErrPanicf(err, "Error checking monitors")
 			panic(err)
 		}
-		sleepTime := time.Duration(config.CheckInterval) * time.Second
+		time.Sleep(config.CheckInterval.Value())
 		time.Sleep(sleepTime)
 	}
 }
--- a/main_test.go
+++ b/main_test.go
@ -16,9 +16,9 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:    "Success",
-						Command: []string{"true"},
+						Command: CommandOrShell{Command: []string{"true"}},
 					},
 				},
 			},
@ -28,34 +28,22 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Failure",
-						Command:    []string{"false"},
+						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertAfter: 1,
 					},
 					&Monitor{
 						Name:       "Failure",
 						Command:    []string{"false"},
 						AlertDown:  []string{"unknown"},
 						AlertAfter: 1,
 					},
 				},
 			},
 			expectErr: false,
-			name:      "Monitor failure, no and unknown alerts",
+			name:      "Monitor failure, no alerts",
 		},
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Success",
-						Command:    []string{"ls"},
+						Command:    CommandOrShell{Command: []string{"ls"}},
 						alertCount: 1,
 					},
 					&Monitor{
 						Name:       "Success",
 						Command:    []string{"true"},
 						AlertUp:    []string{"unknown"},
 						alertCount: 1,
 					},
 				},
@ -66,16 +54,44 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Failure",
-						Command:    []string{"false"},
+						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertDown:  []string{"unknown"},
 						AlertAfter: 1,
 					},
 				},
 			},
 			expectErr: true,
 			name:      "Monitor failure, unknown alerts",
 		},
 		{
 			config: Config{
 				Monitors: []*Monitor{
 					{
 						Name:       "Success",
 						Command:    CommandOrShell{Command: []string{"true"}},
 						AlertUp:    []string{"unknown"},
 						alertCount: 1,
 					},
 				},
 			},
 			expectErr: true,
 			name:      "Monitor recovery, unknown alerts",
 		},
 		{
 			config: Config{
 				Monitors: []*Monitor{
 					{
 						Name:       "Failure",
 						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertDown:  []string{"good"},
 						AlertAfter: 1,
 					},
 				},
 				Alerts: map[string]*Alert{
-					"good": &Alert{
+					"good": {
-						Command: []string{"true"},
+						Command: CommandOrShell{Command: []string{"true"}},
 					},
 				},
 			},
@ -85,17 +101,17 @@ func TestCheckMonitors(t *testing.T) {
 		{
 			config: Config{
 				Monitors: []*Monitor{
-					&Monitor{
+					{
 						Name:       "Failure",
-						Command:    []string{"false"},
+						Command:    CommandOrShell{Command: []string{"false"}},
 						AlertDown:  []string{"bad"},
 						AlertAfter: 1,
 					},
 				},
 				Alerts: map[string]*Alert{
-					"bad": &Alert{
+					"bad": {
 						Name:    "bad",
-						Command: []string{"false"},
+						Command: CommandOrShell{Command: []string{"false"}},
 					},
 				},
 			},
@ -105,10 +121,77 @@ func TestCheckMonitors(t *testing.T) {
 	}
 	for _, c := range cases {
-		c.config.Init()
+		err := c.config.Init()
-		err := checkMonitors(&c.config)
+		if err != nil {
 			t.Errorf("checkMonitors(%s): unexpected error reading config: %v", c.name, err)
 		}
 		err = checkMonitors(&c.config)
 		if err == nil && c.expectErr {
 			t.Errorf("checkMonitors(%s): Expected panic, the code did not panic", c.name)
 		} else if err != nil && !c.expectErr {
 			t.Errorf("checkMonitors(%s): Did not expect an error, but we got one anyway: %v", c.name, err)
 		}
 	}
 }
 func TestFirstRunAlerts(t *testing.T) {
 	cases := []struct {
 		config        Config
 		expectErr     bool
 		startupAlerts []string
 		name          string
 	}{
 		{
 			config:        Config{},
 			expectErr:     false,
 			startupAlerts: []string{},
 			name:          "Empty",
 		},
 		{
 			config:        Config{},
 			expectErr:     true,
 			startupAlerts: []string{"missing"},
 			name:          "Unknown",
 		},
 		{
 			config: Config{
 				Alerts: map[string]*Alert{
 					"good": {
 						Command: CommandOrShell{Command: []string{"true"}},
 					},
 				},
 			},
 			expectErr:     false,
 			startupAlerts: []string{"good"},
 			name:          "Successful alert",
 		},
 		{
 			config: Config{
 				Alerts: map[string]*Alert{
 					"bad": {
 						Name:    "bad",
 						Command: CommandOrShell{Command: []string{"false"}},
 					},
 				},
 			},
 			expectErr:     true,
 			startupAlerts: []string{"bad"},
 			name:          "Failed alert",
 		},
 	}
 	for _, c := range cases {
 		err := c.config.Init()
 		if err != nil {
 			t.Errorf("sendFirstRunAlerts(%s): unexpected error reading config: %v", c.name, err)
 		}
 		err = sendStartupAlerts(&c.config, c.startupAlerts)
 		if err == nil && c.expectErr {
 			t.Errorf("sendFirstRunAlerts(%s): Expected error, the code did not error", c.name)
 		} else if err != nil && !c.expectErr {
 			t.Errorf("sendFirstRunAlerts(%s): Did not expect an error, but we got one anyway: %v", c.name, err)
 		}
 	}
 }
--- a/metrics.go
+++ b/metrics.go
@ -0,0 +1,117 @@
 package main
 import (
 	"fmt"
 	"net/http"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 // TODO: Not sure if this is the best way to handle. A global instance for
 // metrics isn't bad, but it might be nice to curry versions of the metrics
 // for each monitor. Especially since every monitor has it's own. Perhaps
 // another new function that essentially curries each metric for a given
 // monitor name would do. This could be run when validating monitors and
 // initializing alert templates.
 // MinitorMetrics contains all counters and metrics that Minitor will need to access
 type MinitorMetrics struct {
 	alertCount    *prometheus.CounterVec
 	checkCount    *prometheus.CounterVec
 	checkTime     *prometheus.GaugeVec
 	monitorStatus *prometheus.GaugeVec
 }
 // NewMetrics creates and initializes all metrics
 func NewMetrics() *MinitorMetrics {
 	// Initialize all metrics
 	metrics := &MinitorMetrics{
 		alertCount: prometheus.NewCounterVec(
 			prometheus.CounterOpts{
 				Name: "minitor_alert_total",
 				Help: "Number of Minitor alerts",
 			},
 			[]string{"alert", "monitor"},
 		),
 		checkCount: prometheus.NewCounterVec(
 			prometheus.CounterOpts{
 				Name: "minitor_check_total",
 				Help: "Number of Minitor checks",
 			},
 			[]string{"monitor", "status", "is_alert"},
 		),
 		checkTime: prometheus.NewGaugeVec(
 			prometheus.GaugeOpts{
 				Name: "minitor_check_milliseconds",
 				Help: "Time in miliseconds that a check ran for",
 			},
 			[]string{"monitor", "status"},
 		),
 		monitorStatus: prometheus.NewGaugeVec(
 			prometheus.GaugeOpts{
 				Name: "minitor_monitor_up_count",
 				Help: "Status of currently responsive monitors",
 			},
 			[]string{"monitor"},
 		),
 	}
 	// Register newly created metrics
 	prometheus.MustRegister(metrics.alertCount)
 	prometheus.MustRegister(metrics.checkCount)
 	prometheus.MustRegister(metrics.checkTime)
 	prometheus.MustRegister(metrics.monitorStatus)
 	return metrics
 }
 // SetMonitorStatus sets the current status of Monitor
 func (metrics *MinitorMetrics) SetMonitorStatus(monitor string, isUp bool) {
 	val := 0.0
 	if isUp {
 		val = 1.0
 	}
 	metrics.monitorStatus.With(prometheus.Labels{"monitor": monitor}).Set(val)
 }
 // CountCheck counts the result of a particular Monitor check
 func (metrics *MinitorMetrics) CountCheck(monitor string, isSuccess bool, ms int64, isAlert bool) {
 	status := "failure"
 	if isSuccess {
 		status = "success"
 	}
 	alertVal := "false"
 	if isAlert {
 		alertVal = "true"
 	}
 	metrics.checkCount.With(
 		prometheus.Labels{"monitor": monitor, "status": status, "is_alert": alertVal},
 	).Inc()
 	metrics.checkTime.With(
 		prometheus.Labels{"monitor": monitor, "status": status},
 	).Set(float64(ms))
 }
 // CountAlert counts an alert
 func (metrics *MinitorMetrics) CountAlert(monitor string, alert string) {
 	metrics.alertCount.With(
 		prometheus.Labels{
 			"alert":   alert,
 			"monitor": monitor,
 		},
 	).Inc()
 }
 // ServeMetrics starts an http server with a Prometheus metrics handler
 func ServeMetrics() {
 	http.Handle("/metrics", promhttp.Handler())
 	host := fmt.Sprintf(":%d", MetricsPort)
 	_ = http.ListenAndServe(host, nil)
 }
--- a/monitor.go
+++ b/monitor.go
@ -1,38 +1,37 @@
 package main
 import (
 	"log"
 	"math"
 	"os/exec"
 	"time"
 	"git.iamthefij.com/iamthefij/slog"
 )
 // Monitor represents a particular periodic check of a command
-type Monitor struct {
+type Monitor struct { //nolint:maligned
 	// Config values
 	AlertAfter    int16             `yaml:"alert_after"`
 	AlertEvery    *int16            `yaml:"alert_every"`
 	CheckInterval SecondsOrDuration `yaml:"check_interval"`
 	Name          string
 	Command       []string
 	CommandShell  string   `yaml:"command_shell"`
 	AlertDown     []string `yaml:"alert_down"`
 	AlertUp       []string `yaml:"alert_up"`
-	CheckInterval float64  `yaml:"check_interval"`
+	Command       CommandOrShell
-	AlertAfter    int16    `yaml:"alert_after"`
+
 	AlertEvery    int16    `yaml:"alert_every"`
 	// Other values
 	lastCheck    time.Time
 	lastOutput   string
 	alertCount        int16
 	failureCount      int16
 	lastCheck         time.Time
 	lastSuccess       time.Time
 	lastOutput        string
 	lastCheckDuration time.Duration
 }
 // IsValid returns a boolean indicating if the Monitor has been correctly
 // configured
 func (monitor Monitor) IsValid() bool {
-	atLeastOneCommand := (monitor.CommandShell != "" || monitor.Command != nil)
+	return (!monitor.Command.Empty() &&
 	atMostOneCommand := (monitor.CommandShell == "" || monitor.Command == nil)
 	return (atLeastOneCommand &&
 		atMostOneCommand &&
 		monitor.getAlertAfter() > 0 &&
 		monitor.AlertDown != nil)
 }
@ -44,25 +43,29 @@ func (monitor Monitor) ShouldCheck() bool {
 		return true
 	}
-	sinceLastCheck := time.Now().Sub(monitor.lastCheck).Seconds()
+	sinceLastCheck := time.Since(monitor.lastCheck)
-	return sinceLastCheck >= monitor.CheckInterval
+
 	return sinceLastCheck >= monitor.CheckInterval.Value()
 }
 // Check will run the command configured by the Monitor and return a status
 // and a possible AlertNotice
 func (monitor *Monitor) Check() (bool, *AlertNotice) {
 	var cmd *exec.Cmd
-	if monitor.Command != nil {
+	if monitor.Command.Command != nil {
-		cmd = exec.Command(monitor.Command[0], monitor.Command[1:]...)
+		cmd = exec.Command(monitor.Command.Command[0], monitor.Command.Command[1:]...)
 	} else {
-		cmd = ShellCommand(monitor.CommandShell)
+		cmd = ShellCommand(monitor.Command.ShellCommand)
 	}
 	checkStartTime := time.Now()
 	output, err := cmd.CombinedOutput()
 	monitor.lastCheck = time.Now()
 	monitor.lastOutput = string(output)
 	monitor.lastCheckDuration = monitor.lastCheck.Sub(checkStartTime)
 	var alertNotice *AlertNotice
 	isSuccess := (err == nil)
 	if isSuccess {
 		alertNotice = monitor.success()
@ -70,17 +73,11 @@ func (monitor *Monitor) Check() (bool, *AlertNotice) {
 		alertNotice = monitor.failure()
 	}
-	if LogDebug {
+	slog.Debugf("Command output: %s", monitor.lastOutput)
-		log.Printf("DEBUG: Command output: %s", monitor.lastOutput)
+	slog.OnErrWarnf(err, "Command result: %v", err)
 	}
 	if err != nil {
 		if LogDebug {
 			log.Printf("DEBUG: Command result: %v", err)
 		}
 	}
-	log.Printf(
+	slog.Infof(
-		"INFO: %s success=%t, alert=%t",
+		"%s success=%t, alert=%t",
 		monitor.Name,
 		isSuccess,
 		alertNotice != nil,
@ -89,15 +86,22 @@ func (monitor *Monitor) Check() (bool, *AlertNotice) {
 	return isSuccess, alertNotice
 }
-func (monitor Monitor) isUp() bool {
+// IsUp returns the status of the current monitor
 func (monitor Monitor) IsUp() bool {
 	return monitor.alertCount == 0
 }
 // LastCheckMilliseconds gives number of miliseconds the last check ran for
 func (monitor Monitor) LastCheckMilliseconds() int64 {
 	return monitor.lastCheckDuration.Milliseconds()
 }
 func (monitor *Monitor) success() (notice *AlertNotice) {
-	if !monitor.isUp() {
+	if !monitor.IsUp() {
 		// Alert that we have recovered
 		notice = monitor.createAlertNotice(true)
 	}
 	monitor.failureCount = 0
 	monitor.alertCount = 0
 	monitor.lastSuccess = time.Now()
@ -109,15 +113,14 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 	monitor.failureCount++
 	// If we haven't hit the minimum failures, we can exit
 	if monitor.failureCount < monitor.getAlertAfter() {
-		if LogDebug {
+		slog.Debugf(
-			log.Printf(
+			"%s failed but did not hit minimum failures. "+
 				"DEBUG: %s failed but did not hit minimum failures. "+
 				"Count: %v alert after: %v",
 			monitor.Name,
 			monitor.failureCount,
 			monitor.getAlertAfter(),
 		)
-		}
+
 		return
 	}
@ -125,19 +128,20 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 	failureCount := (monitor.failureCount - monitor.getAlertAfter())
 	// Use alert cadence to determine if we should alert
-	if monitor.AlertEvery > 0 {
+	switch {
-		// Handle integer number of failures before alerting
+	case monitor.AlertEvery == nil, *monitor.AlertEvery == 0:
 		if failureCount%monitor.AlertEvery == 0 {
 			notice = monitor.createAlertNotice(false)
 		}
 	} else if monitor.AlertEvery == 0 {
 		// Handle alerting on first failure only
 		if failureCount == 0 {
 			notice = monitor.createAlertNotice(false)
 		}
-	} else {
+	case *monitor.AlertEvery > 0:
 		// Handle integer number of failures before alerting
 		if failureCount%*monitor.AlertEvery == 0 {
 			notice = monitor.createAlertNotice(false)
 		}
 	default:
 		// Handle negative numbers indicating an exponential backoff
-		if failureCount >= int16(math.Pow(2, float64(monitor.alertCount))-1) {
+		if failureCount >= int16(math.Pow(2, float64(monitor.alertCount))-1) { //nolint:gomnd
 			notice = monitor.createAlertNotice(false)
 		}
 	}
@ -147,7 +151,7 @@ func (monitor *Monitor) failure() (notice *AlertNotice) {
 		monitor.alertCount++
 	}
-	return
+	return notice
 }
 func (monitor Monitor) getAlertAfter() int16 {
@ -155,18 +159,18 @@ func (monitor Monitor) getAlertAfter() int16 {
 	// Zero is one!
 	if monitor.AlertAfter == 0 {
 		return 1
 	} else {
 		return monitor.AlertAfter
 	}
 	return monitor.AlertAfter
 }
 // GetAlertNames gives a list of alert names for a given monitor status
 func (monitor Monitor) GetAlertNames(up bool) []string {
 	if up {
 		return monitor.AlertUp
 	} else {
 		return monitor.AlertDown
 	}
 	return monitor.AlertDown
 }
 func (monitor Monitor) createAlertNotice(isUp bool) *AlertNotice {
--- a/monitor_test.go
+++ b/monitor_test.go
@ -13,25 +13,22 @@ func TestMonitorIsValid(t *testing.T) {
 		expected bool
 		name     string
 	}{
-		{Monitor{Command: []string{"echo", "test"}, AlertDown: []string{"log"}}, true, "Command only"},
+		{Monitor{Command: CommandOrShell{Command: []string{"echo", "test"}}, AlertDown: []string{"log"}}, true, "Command only"},
-		{Monitor{CommandShell: "echo test", AlertDown: []string{"log"}}, true, "CommandShell only"},
+		{Monitor{Command: CommandOrShell{ShellCommand: "echo test"}, AlertDown: []string{"log"}}, true, "CommandShell only"},
-		{Monitor{Command: []string{"echo", "test"}}, false, "No AlertDown"},
+		{Monitor{Command: CommandOrShell{Command: []string{"echo", "test"}}}, false, "No AlertDown"},
 		{Monitor{AlertDown: []string{"log"}}, false, "No commands"},
-		{
+		{Monitor{Command: CommandOrShell{Command: []string{"echo", "test"}}, AlertDown: []string{"log"}, AlertAfter: -1}, false, "Invalid alert threshold, -1"},
 			Monitor{Command: []string{"echo", "test"}, CommandShell: "echo test", AlertDown: []string{"log"}},
 			false,
 			"Both commands",
 		},
 		{Monitor{Command: []string{"echo", "test"}, AlertDown: []string{"log"}, AlertAfter: -1}, false, "Invalid alert threshold, -1"},
 	}
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		actual := c.monitor.IsValid()
 		if actual != c.expected {
 			t.Errorf("IsValid(%v), expected=%t actual=%t", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -48,9 +45,9 @@ func TestMonitorShouldCheck(t *testing.T) {
 		name     string
 	}{
 		{Monitor{}, true, "Empty"},
-		{Monitor{lastCheck: timeNow, CheckInterval: 15}, false, "Just checked"},
+		{Monitor{lastCheck: timeNow, CheckInterval: SecondsOrDuration{time.Second * 15}}, false, "Just checked"},
-		{Monitor{lastCheck: timeTenSecAgo, CheckInterval: 15}, false, "-10s"},
+		{Monitor{lastCheck: timeTenSecAgo, CheckInterval: SecondsOrDuration{time.Second * 15}}, false, "-10s"},
-		{Monitor{lastCheck: timeTwentySecAgo, CheckInterval: 15}, true, "-20s"},
+		{Monitor{lastCheck: timeTwentySecAgo, CheckInterval: SecondsOrDuration{time.Second * 15}}, true, "-20s"},
 	}
 	for _, c := range cases {
@ -61,7 +58,7 @@ func TestMonitorShouldCheck(t *testing.T) {
 	}
 }
-// TestMonitorIsUp tests the Monitor.isUp()
+// TestMonitorIsUp tests the Monitor.IsUp()
 func TestMonitorIsUp(t *testing.T) {
 	cases := []struct {
 		monitor  Monitor
@ -76,11 +73,13 @@ func TestMonitorIsUp(t *testing.T) {
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
-		actual := c.monitor.isUp()
+
 		actual := c.monitor.IsUp()
 		if actual != c.expected {
-			t.Errorf("isUp(%v), expected=%t actual=%t", c.name, c.expected, actual)
+			t.Errorf("IsUp(%v), expected=%t actual=%t", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -101,11 +100,13 @@ func TestMonitorGetAlertNames(t *testing.T) {
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		actual := c.monitor.GetAlertNames(c.up)
 		if !EqualSliceString(actual, c.expected) {
 			t.Errorf("GetAlertNames(%v), expected=%v actual=%v", c.name, c.expected, actual)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -124,12 +125,15 @@ func TestMonitorSuccess(t *testing.T) {
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		notice := c.monitor.success()
 		hasNotice := (notice != nil)
 		if hasNotice != c.expectNotice {
 			t.Errorf("success(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -137,27 +141,32 @@ func TestMonitorSuccess(t *testing.T) {
 // TestMonitorFailureAlertAfter tests that alerts will not trigger until
 // hitting the threshold provided by AlertAfter
 func TestMonitorFailureAlertAfter(t *testing.T) {
 	var alertEvery int16 = 1
 	cases := []struct {
 		monitor      Monitor
 		expectNotice bool
 		name         string
 	}{
 		{Monitor{AlertAfter: 1}, true, "Empty"}, // Defaults to true because and AlertEvery default to 0
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 1}, true, "Alert after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery}, true, "Alert after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 1}, true, "Alert after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery}, true, "Alert after 1: second failure"},
-		{Monitor{failureCount: 0, AlertAfter: 20, AlertEvery: 1}, false, "Alert after 20: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 20, AlertEvery: &alertEvery}, false, "Alert after 20: first failure"},
-		{Monitor{failureCount: 19, AlertAfter: 20, AlertEvery: 1}, true, "Alert after 20: 20th failure"},
+		{Monitor{failureCount: 19, AlertAfter: 20, AlertEvery: &alertEvery}, true, "Alert after 20: 20th failure"},
-		{Monitor{failureCount: 20, AlertAfter: 20, AlertEvery: 1}, true, "Alert after 20: 21st failure"},
+		{Monitor{failureCount: 20, AlertAfter: 20, AlertEvery: &alertEvery}, true, "Alert after 20: 21st failure"},
 	}
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		notice := c.monitor.failure()
 		hasNotice := (notice != nil)
 		if hasNotice != c.expectNotice {
 			t.Errorf("failure(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -165,6 +174,11 @@ func TestMonitorFailureAlertAfter(t *testing.T) {
 // TestMonitorFailureAlertEvery tests that alerts will trigger
 // on the expected intervals
 func TestMonitorFailureAlertEvery(t *testing.T) {
 	var alertEvery0, alertEvery1, alertEvery2 int16
 	alertEvery0 = 0
 	alertEvery1 = 1
 	alertEvery2 = 2
 	cases := []struct {
 		monitor      Monitor
 		expectNotice bool
@ -179,20 +193,20 @@ func TestMonitorFailureAlertEvery(t *testing.T) {
 			For usabilty, this should be consistent. Consistent with what though? minitor-py? Or itself? Dun dun duuuunnnnn!
 		*/
-		{Monitor{AlertAfter: 1}, true, "Empty"}, // Defaults to true because AlertAfter and AlertEvery default to 0
+		{Monitor{AlertAfter: 1}, true, "Empty"}, // Defaults to true because AlertAfter and AlertEvery default to nil
 		// Alert first time only, after 1
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 0}, true, "Alert first time only after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery0}, true, "Alert first time only after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 0}, false, "Alert first time only after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery0}, false, "Alert first time only after 1: second failure"},
-		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: 0}, false, "Alert first time only after 1: third failure"},
+		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: &alertEvery0}, false, "Alert first time only after 1: third failure"},
 		// Alert every time, after 1
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 1}, true, "Alert every time after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery1}, true, "Alert every time after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 1}, true, "Alert every time after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery1}, true, "Alert every time after 1: second failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 1}, true, "Alert every time after 1: third failure"},
+		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: &alertEvery1}, true, "Alert every time after 1: third failure"},
 		// Alert every other time, after 1
-		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: 2}, true, "Alert every other time after 1: first failure"},
+		{Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEvery2}, true, "Alert every other time after 1: first failure"},
-		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: 2}, false, "Alert every other time after 1: second failure"},
+		{Monitor{failureCount: 1, AlertAfter: 1, AlertEvery: &alertEvery2}, false, "Alert every other time after 1: second failure"},
-		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: 2}, true, "Alert every other time after 1: third failure"},
+		{Monitor{failureCount: 2, AlertAfter: 1, AlertEvery: &alertEvery2}, true, "Alert every other time after 1: third failure"},
-		{Monitor{failureCount: 3, AlertAfter: 1, AlertEvery: 2}, false, "Alert every other time after 1: fourth failure"},
+		{Monitor{failureCount: 3, AlertAfter: 1, AlertEvery: &alertEvery2}, false, "Alert every other time after 1: fourth failure"},
 	}
 	for _, c := range cases {
@ -200,10 +214,12 @@ func TestMonitorFailureAlertEvery(t *testing.T) {
 		notice := c.monitor.failure()
 		hasNotice := (notice != nil)
 		if hasNotice != c.expectNotice {
 			t.Errorf("failure(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -211,6 +227,8 @@ func TestMonitorFailureAlertEvery(t *testing.T) {
 // TestMonitorFailureExponential tests that alerts will trigger
 // with an exponential backoff after repeated failures
 func TestMonitorFailureExponential(t *testing.T) {
 	var alertEveryExp int16 = -1
 	cases := []struct {
 		expectNotice bool
 		name         string
@ -227,16 +245,19 @@ func TestMonitorFailureExponential(t *testing.T) {
 	// Unlike previous tests, this one requires a static Monitor with repeated
 	// calls to the failure method
-	monitor := Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: -1}
+	monitor := Monitor{failureCount: 0, AlertAfter: 1, AlertEvery: &alertEveryExp}
 	for _, c := range cases {
 		log.Printf("Testing case %s", c.name)
 		notice := monitor.failure()
 		hasNotice := (notice != nil)
 		if hasNotice != c.expectNotice {
 			t.Errorf("failure(%v), expected=%t actual=%t", c.name, c.expectNotice, hasNotice)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
@ -248,28 +269,29 @@ func TestMonitorCheck(t *testing.T) {
 		hasNotice  bool
 		lastOutput string
 	}
 	cases := []struct {
 		monitor Monitor
 		expect  expected
 		name    string
 	}{
 		{
-			Monitor{Command: []string{"echo", "success"}},
+			Monitor{Command: CommandOrShell{Command: []string{"echo", "success"}}},
 			expected{isSuccess: true, hasNotice: false, lastOutput: "success\n"},
 			"Test successful command",
 		},
 		{
-			Monitor{CommandShell: "echo success"},
+			Monitor{Command: CommandOrShell{ShellCommand: "echo success"}},
 			expected{isSuccess: true, hasNotice: false, lastOutput: "success\n"},
 			"Test successful command shell",
 		},
 		{
-			Monitor{Command: []string{"total", "failure"}},
+			Monitor{Command: CommandOrShell{Command: []string{"total", "failure"}}},
 			expected{isSuccess: false, hasNotice: true, lastOutput: ""},
 			"Test failed command",
 		},
 		{
-			Monitor{CommandShell: "false"},
+			Monitor{Command: CommandOrShell{ShellCommand: "false"}},
 			expected{isSuccess: false, hasNotice: true, lastOutput: ""},
 			"Test failed command shell",
 		},
@ -295,6 +317,7 @@ func TestMonitorCheck(t *testing.T) {
 			t.Errorf("Check(%v) (output), expected=%v actual=%v", c.name, c.expect.lastOutput, lastOutput)
 			log.Printf("Case failed: %s", c.name)
 		}
 		log.Println("-----")
 	}
 }
--- a/sample-config.yml
+++ b/sample-config.yml
@ -1,21 +1,34 @@
-check_interval: 30
+---
 check_interval: 5
 monitors:
-  - name: My Website
+  - name: Fake Website
-    command: [ 'curl', '-s', '-o', '/dev/null', 'https://minitor.mon' ]
+    command: ["curl", "-s", "-o", "/dev/null", "https://minitor.mon"]
-    alert_down: [ log, mailgun_down, sms_down ]
+    alert_down: [log_down, mailgun_down, sms_down]
-    alert_up: [ log, email_up ]
+    alert_up: [log_up, email_up]
-    check_interval: 30 # Must be at minimum the global `check_interval`
+    check_interval: 10 # Must be at minimum the global `check_interval`
    alert_after: 3
    alert_every: -1 # Defaults to -1 for exponential backoff. 0 to disable repeating
  - name: Real Website
    command: ["curl", "-s", "-o", "/dev/null", "https://google.com"]
    alert_down: [log_down, mailgun_down, sms_down]
    alert_up: [log_up, email_up]
    check_interval: 5
    alert_after: 3
    alert_every: -1
 alerts:
  log_down:
    command: ["echo", "Minitor failure for {{.MonitorName}}"]
  log_up:
    command: ["echo", "Minitor recovery for {{.MonitorName}}"]
  email_up:
-    command: [ sendmail, "me@minitor.mon",  "Recovered: {monitor_name}",  "We're back!" ]
+    command:
      [sendmail, "me@minitor.mon", "Recovered: {monitor_name}", "We're back!"]
  mailgun_down:
    command: >
      curl -s -X POST
-      -F subject="Alert! {monitor_name} failed"
+      -F subject="Alert! {{.MonitorName}} failed"
      -F from="Minitor <minitor@minitor.mon>"
      -F to=me@minitor.mon
      -F text="Our monitor failed"
@ -23,7 +36,7 @@ alerts:
      -u "api:${MAILGUN_API_KEY}"
  sms_down:
    command: >
-      curl -s -X POST -F "Body=Failure! {monitor_name} has failed"
+      curl -s -X POST -F "Body=Failure! {{.MonitorName}} has failed"
      -F "From=${AVAILABLE_NUMBER}" -F "To=${MY_PHONE}"
      "https://api.twilio.com/2010-04-01/Accounts/${ACCOUNT_SID}/Messages"
      -u "${ACCOUNT_SID}:${AUTH_TOKEN}"
--- a/scripts/README.md
+++ b/scripts/README.md
@ -0,0 +1,5 @@
 # Minitor Scripts
 A collection of some handy scripts to use with Minitor
 These are not included with the Python package, but they are included in the Docker image in `/app/scripts`.
--- a/scripts/curl_ok.sh
+++ b/scripts/curl_ok.sh
@ -0,0 +1,6 @@
 #! /bin/sh
 # Used for a basic HTTP health check
 # Avoids output from non-errors and will fail if the HTTP response is unsuccessful
 curl --silent --show-error --fail -o /dev/null "$@"
--- a/scripts/docker_check.sh
+++ b/scripts/docker_check.sh
@ -0,0 +1,63 @@
 #! /bin/bash
 set -e
 #################
 # docker_check.sh
 #
 # Checks the most recent state exit code of a Docker container
 #################
 # Docker host will default to a socket
 # To override, export DOCKER_HOST to a new hostname
 DOCKER_HOST="${DOCKER_HOST:=socket}"
 container_name="$1"
 num_log_lines="$2"
 # Curls Docker either using a socket or URL
 function curl_docker {
    local path="$1"
    if [ "$DOCKER_HOST" == "socket" ]; then
        curl --unix-socket /var/run/docker.sock "http://localhost/$path" 2>/dev/null
    else
        curl "http://${DOCKER_HOST}/$path" 2>/dev/null
    fi
 }
 # Returns caintainer ID for a given container name
 function get_container_id {
    local container_name="$1"
    curl_docker 'containers/json?all=1' \
        | jq -r ".[] | {Id, Name: .Names[]} | select(.Name == \"/${container_name}\") | .Id"
 }
 # Returns container JSON
 function inspect_container {
    local container_id="$1"
    curl_docker "containers/$container_id/json"
 }
 # Gets some lines from docker log
 function get_logs {
    container_id="$1"
    num_lines="$2"
    curl_docker "containers/$container_id/logs?stdout=1&stderr=1" | tail -n "$num_lines"
 }
 if [ -z "$container_name" ]; then
    echo "Usage: $0 container_name [num_log_lines]"
    echo "Will exit with the last status code of continer with provided name"
    exit 1
 fi
 container_id=$(get_container_id "$container_name")
 if [ -z "$container_id" ]; then
    echo "ERROR: Could not find container with name: $container_name"
    exit 1
 fi
 exit_code=$(inspect_container "$container_id" | jq -r .State.ExitCode)
 if [ -n "$num_log_lines" ]; then
    get_logs "$container_id" "$num_log_lines"
 fi
 exit "$exit_code"
--- a/scripts/docker_healthcheck.sh
+++ b/scripts/docker_healthcheck.sh
@ -0,0 +1,73 @@
 #! /bin/bash
 set -e
 #################
 # docker_healthcheck.sh
 #
 # Returns the results of a Docker Healthcheck for a container
 #################
 # Docker host will default to a socket
 # To override, export DOCKER_HOST to a new hostname
 DOCKER_HOST="${DOCKER_HOST:=socket}"
 container_name="$1"
 num_log_lines="$2"
 # Curls Docker either using a socket or URL
 function curl_docker {
    local path="$1"
    if [ "$DOCKER_HOST" == "socket" ]; then
        curl --unix-socket /var/run/docker.sock "http://localhost/$path" 2>/dev/null
    else
        curl "http://${DOCKER_HOST}/$path" 2>/dev/null
    fi
 }
 # Returns caintainer ID for a given container name
 function get_container_id {
    local container_name="$1"
    curl_docker 'containers/json?all=1' \
        | jq -r ".[] | {Id, Name: .Names[]} | select(.Name == \"/${container_name}\") | .Id"
 }
 # Returns container JSON
 function inspect_container {
    local container_id="$1"
    curl_docker "containers/$container_id/json"
 }
 # Gets some lines from docker log
 function get_logs {
    container_id="$1"
    num_lines="$2"
    curl_docker "containers/$container_id/logs?stdout=1&stderr=1" | tail -n "$num_lines"
 }
 if [ -z "$container_name" ]; then
    echo "Usage: $0 container_name [num_log_lines]"
    echo "Will return results of healthcheck for continer with provided name"
    exit 1
 fi
 container_id=$(get_container_id "$container_name")
 if [ -z "$container_id" ]; then
    echo "ERROR: Could not find container with name: $container_name"
    exit 1
 fi
 health=$(inspect_container "$container_id" | jq -r '.State.Health.Status')
 if [ -n "$num_log_lines" ]; then
    get_logs "$container_id" "$num_log_lines"
 fi
 case "$health" in
    null)
        echo "No healthcheck results"
        ;;
    starting|healthy)
        echo "Status: '$health'"
        ;;
    *)
        echo "Status: '$health'"
        exit 1
 esac
--- a/test/invalid-config-missing-alerts.yml
+++ b/test/invalid-config-missing-alerts.yml
@ -6,4 +6,3 @@ monitors:
    alert_down: [ 'alert_down', 'log_shell', 'log_command' ]
    # alert_every: -1
    alert_every: 0
--- a/test/valid-config-default-values.yml
+++ b/test/valid-config-default-values.yml
@ -0,0 +1,12 @@
 ---
 check_interval: 1
 default_alert_down: ["log_command"]
 default_alert_after: 1
 monitors:
  - name: Command
    command: ["echo", "$PATH"]
 alerts:
  log_command:
    command: ["echo", "regular", '"command!!!"', "{{.MonitorName}}"]
--- a/test/valid-config.yml
+++ b/test/valid-config.yml
@ -1,22 +1,25 @@
 ---
 check_interval: 1
 monitors:
  - name: Command
-    command: ['echo', '$PATH']
+    command: ["echo", "$PATH"]
-    alert_down: [ 'log_command', 'log_shell' ]
+    alert_down: ["log_command", "log_shell"]
    alert_every: 0
    check_interval: 10s
  - name: Shell
-    command_shell: >
+    command: >
      echo 'Some string with stuff';
      echo 'another line';
      echo $PATH;
      exit 1
-    alert_down: [ 'log_command', 'log_shell' ]
+    alert_down: ["log_command", "log_shell"]
    alert_after: 5
    alert_every: 0
    check_interval: 1m
 alerts:
  log_command:
-    command: [ 'echo', 'regular', '"command!!!"', "{{.MonitorName}}" ]
+    command: ["echo", "regular", '"command!!!"', "{{.MonitorName}}"]
  log_shell:
-    command_shell: echo "Failure on {{.MonitorName}} User is $USER"
+    command: echo "Failure on {{.MonitorName}} User is $USER"
--- a/test/valid-default-log-alert.yml
+++ b/test/valid-default-log-alert.yml
@ -0,0 +1,8 @@
 ---
 check_interval: 1
 monitors:
  - name: Command
    command: ['echo', '$PATH']
    alert_down: ['log']
    alert_every: 0
--- a/test/valid-verify-multi-line.yml
+++ b/test/valid-verify-multi-line.yml
@ -0,0 +1,18 @@
 ---
 check_interval: 1
 monitors:
  - name: Shell
    command: >
      echo 'Some string with stuff';
      echo "<angle brackets>";
      exit 1
    alert_down: ['log_shell']
    alert_after: 1
    alert_every: 0
 alerts:
  log_shell:
    command: |
      echo 'Some string with stuff'
      echo '<angle brackets>'
--- a/util.go
+++ b/util.go
@ -5,20 +5,10 @@ import (
 	"strings"
 )
 // escapeCommandShell accepts a command to be executed by a shell and escapes it
 func escapeCommandShell(command string) string {
 	// Remove extra spaces and newlines from ends
 	command = strings.TrimSpace(command)
 	// TODO: Not sure if this part is actually needed. Should verify
 	// Escape double quotes since this will be passed in as an argument
 	command = strings.Replace(command, `"`, `\"`, -1)
 	return command
 }
 // ShellCommand takes a string and executes it as a command using `sh`
 func ShellCommand(command string) *exec.Cmd {
-	shellCommand := []string{"sh", "-c", escapeCommandShell(command)}
+	shellCommand := []string{"sh", "-c", strings.TrimSpace(command)}
-	//log.Printf("Shell command: %v", shellCommand)
+
 	return exec.Command(shellCommand[0], shellCommand[1:]...)
 }
@ -27,10 +17,12 @@ func EqualSliceString(a, b []string) bool {
 	if len(a) != len(b) {
 		return false
 	}
 	for i, val := range a {
 		if val != b[i] {
 			return false
 		}
 	}
 	return true
 }
Author	SHA1	Message	Date
Ian Fijolek	312821fa8d	Add pycompat warning Some checks failed continuous-integration/drone/push Build is failing Details	2024-11-14 13:09:23 -08:00
Ian Fijolek	7604138c9e	Use buildx Some checks failed continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is failing Details	2024-04-03 12:15:11 -07:00
Ian Fijolek	f58b4c1495	Adds ability to run specified alerts on startup Some checks failed continuous-integration/drone/push Build is failing Details This is helpful to determine if your alerts are valid before an actual failure	2024-04-03 12:03:17 -07:00
Ian Fijolek	6a2b44673e	Upgrade prometheus client and protobuf Some checks failed continuous-integration/drone/push Build is failing Details	2024-04-03 11:28:01 -07:00
Ian Fijolek	01cca50532	Add tzdata All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details Allows setting container timezone using TZ env variable	2023-08-11 06:20:35 -07:00
Ian Fijolek	2789aa63e4	More loosely pins apk packages	2023-08-11 06:20:15 -07:00
Ian Fijolek	37db4b2db0	Update error string when failing to send alert All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details Wrap both originating errors	2023-08-10 16:23:02 -04:00
Ian Fijolek	41a1dbeceb	Add date format functions	2023-08-10 16:22:30 -04:00
Ian Fijolek	c02d64d674	Update go to 1.20 All checks were successful continuous-integration/drone/push Build is passing Details	2023-08-10 16:21:33 -04:00
Ian Fijolek	46f4561bea	Update alpine and system package versions All checks were successful continuous-integration/drone/push Build is passing Details Bump to alpine 3.18	2023-06-14 16:52:04 -07:00
Ian Fijolek	a1e0e9698b	Add dig and nslookup Some checks failed continuous-integration/drone/push Build is failing Details continuous-integration/drone/tag Build is passing Details	2023-05-05 14:07:53 -07:00
Ian Fijolek	ded4e129a1	Switch from deprecated ioutil All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2023-04-18 16:17:06 -07:00
Ian Fijolek	95cb24ac04	Upgrade golangci-lint pre-commit hook	2023-04-18 16:16:53 -07:00
Ian Fijolek	e6447b615f	Upgrade some dependencies Some checks failed continuous-integration/drone/push Build is failing Details	2023-04-18 16:09:41 -07:00
Ian Fijolek	2680eabd40	Rebuild when mod files change	2023-04-18 16:09:30 -07:00
Ian Fijolek	23340e823f	Update go version in go.mod Some checks failed continuous-integration/drone/push Build is failing Details	2023-04-18 16:02:04 -07:00
Ian Fijolek	99b8723abc	Add curl script to simplify http healthchecks	2023-04-18 15:56:59 -07:00
Ian Fijolek	7d87c3d036	Add default values for AlertEvery There is also a test error corrected in TestMonitorFailureAlertEvery where the same test conditions were repeated twice.	2022-12-19 15:49:32 -08:00
Ian Fijolek	deec04bf0d	Allow setting of global defaults for some values This helps with reducing redundant config. Note: There is no default for `alert_every` because the zero value has a meaning and cannot be interpreted as an omission.	2022-12-19 15:49:32 -08:00
Ian Fijolek	958446050f	Update linters	2022-12-19 15:34:47 -08:00
Ian Fijolek	88e94642d9	Remove some hooks included in golangci-lint and upgrade existing All checks were successful continuous-integration/drone/push Build is passing Details	2022-06-07 21:39:18 -07:00
Ian Fijolek	bc83a51907	Switch pre-commit url for golang All checks were successful continuous-integration/drone/push Build is passing Details	2022-04-04 20:12:01 -07:00
Ian Fijolek	08b8932331	Update curl version All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2022-01-24 16:08:18 -08:00
Ian Fijolek	9072d97bb8	Make linters happy Some checks failed continuous-integration/drone/push Build is failing Details continuous-integration/drone/tag Build is failing Details	2022-01-24 10:39:53 -08:00
Ian Fijolek	cdd8a69669	Update go version Some checks failed continuous-integration/drone/push Build is failing Details	2021-12-01 14:47:58 -08:00
Ian Fijolek	3c14a02770	Continue checking all monitors after sending alert Previously this was mistakenly returning after sending an alert. Now all alerts will be sent unless there is an exception on one of them.	2021-09-02 10:20:04 -07:00
Ian Fijolek	328ea83c25	Some linting cleanup	2021-09-02 10:19:03 -07:00
Ian Fijolek	ce986e8d1d	Roll back to alpine:3.12 All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details Looks like there is a clock issue with raspbian https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.13.0#time64_requirements	2021-05-12 19:06:41 -07:00
Ian Fijolek	31a4b484bf	Merge branch 'duration-intervals' All checks were successful continuous-integration/drone/push Build is passing Details	2021-05-12 18:32:12 -07:00
Ian Fijolek	49e3635819	Add backwards compatility explanation in Readme All checks were successful continuous-integration/drone/push Build is passing Details	2021-05-12 16:37:59 -07:00
Ian Fijolek	444d060736	Remove qemu-user-static from Dockerfile and update alpine All checks were successful continuous-integration/drone/push Build is passing Details My build machine now has proper qemu support added, so this is not needed	2021-05-12 23:22:24 +00:00
Ian Fijolek	860c2cdf43	Add custom type to parse out seconds as int and durations as strings All checks were successful continuous-integration/drone/push Build is passing Details	2021-05-12 10:33:42 -07:00
Ian Fijolek	befea7375f	Add check runtime metric Some checks failed continuous-integration/drone/push Build is failing Details	2021-05-11 10:41:39 -07:00
Ian Fijolek	04395fa693	Add duration parsing tests	2021-05-11 10:41:39 -07:00
Ian Fijolek	bdf7355fa7	Add duration parsing for intervals	2021-05-11 10:41:39 -07:00
Ian Fijolek	30c2c7d6b2	Add Dockerfile linting back in	2021-05-10 21:53:26 -07:00
Ian Fijolek	5f250f17a8	Add more liniting and update to pass	2021-05-10 21:53:26 -07:00
Ian Fijolek	fda9e1bfc3	Replace log with slog	2021-05-10 21:53:26 -07:00
Ian Fijolek	f0e179851f	Update linting and a test case All checks were successful continuous-integration/drone/push Build is passing Details	2021-01-08 18:31:22 -05:00
Ian Fijolek	9e124803da	Add release uploads All checks were successful continuous-integration/drone/push Build is passing Details	2021-01-08 18:13:48 -05:00
Ian Fijolek	2c4543a7bc	Update go version to 1.15	2021-01-08 18:13:34 -05:00
Ian Fijolek	a1b906b94a	Update for go 1.15	2020-11-16 15:56:31 -08:00
Ian Fijolek	0a5be250b5	Scripts: Add echoing log lines to helper scripts Rather than only returning the status of whether or not a container is healhthy, the helper scripts will now optionally echo some of the latest log lines.	2020-11-16 15:52:21 -08:00
Ian Fijolek	88f77aa27c	Fix Makefile comment	2020-11-16 15:51:41 -08:00
Ian Fijolek	67c2375bba	Remove docker linting for now All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details Drone check doesn't pass. Need to install docker there	2020-07-14 17:29:54 -07:00
Ian Fijolek	aad9eaa32f	Update exported status metric to properly reflect alerting status of a monitor Some checks failed continuous-integration/drone/push Build is failing Details It was using the result of the individual check and not the monitor as a whole	2020-07-14 17:09:56 -07:00
Ian Fijolek	5dc5ba5257	Add docker linting	2020-07-14 17:08:48 -07:00
Ian Fijolek	4aff294739	Set overrided version in drone config All checks were successful continuous-integration/drone/push Build is passing Details	2020-07-07 12:15:53 -07:00
Ian Fijolek	0684b15a44	Update logic for setting version All checks were successful continuous-integration/drone/push Build is passing Details I noticed that versions were not being properly dervied from the git tags. This fixes that in a simpler way by allowing git to describe the current commit with tags, commits, shas, and a dirty maker.	2020-07-07 10:51:13 -07:00
Ian Fijolek	d3826dacde	Update drone to use new linux only target All checks were successful continuous-integration/drone/push Build is passing Details	2020-07-06 20:33:02 -07:00
Ian Fijolek	f8e40c643c	Move static binaries to dist/ for easier publishing All checks were successful continuous-integration/drone/push Build is passing Details This will make it easier to publish them to Github or Gitea releases later. To avoid making the Makefile super complex, this patch also makes use of variables to simplify the Makefile as well.	2020-07-06 20:15:21 -07:00
Ian Fijolek	cffbbd734a	Make default log alert conditional All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details Allow using the default `log` alert for both up and down alerts using Go's templating conditionals. Following this example can do away with the need for an up and down version of every alert.	2020-06-19 09:51:42 -07:00
Ian Fijolek	ad6f3be6ec	Update README with more detailed running instructions from prior project All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2020-02-19 22:13:30 -08:00
Ian Fijolek	ae30f477f7	Add ability to customize metrics port	2020-02-19 22:13:07 -08:00
Ian Fijolek	9dcd8ebf12	Update README to correct differences between py and go versions All checks were successful continuous-integration/drone/push Build is passing Details	2020-02-19 21:56:01 -08:00
Ian Fijolek	11af700618	Merge branch 'minitor-py-compat-rebase' All checks were successful continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2020-02-19 21:21:40 -08:00
Ian Fijolek	00029a6327	Make Python compatability a flag All checks were successful continuous-integration/drone/push Build is passing Details	2020-02-19 17:38:07 -08:00
Ian Fijolek	9c21880efa	Add a default log alert	2020-02-19 17:38:07 -08:00
Ian Fijolek	8b0d3b65cf	Try to allow parsing of Minitor-py templates This will make transition easier for an interim period. Will remove at version 1.0	2020-02-19 17:38:07 -08:00
Ian Fijolek	25c5179d3d	Switch to a single key for command and command shell All checks were successful continuous-integration/drone/push Build is passing Details This makes the configuration more similar to Minitor-py and docker-compose. If a string is passed, it will be executed in a shell. If an array is passed, it will be executed in as a command directly. This breaks compatiblity with previous versions of Minitor-go, but closer to compatiblity with Minitor-py.	2020-02-19 17:38:06 -08:00
Ian Fijolek	eb7ad0b25e	Allow specifying config path as an argument	2020-02-19 17:37:53 -08:00
Ian Fijolek	3b963f420f	Remove underscore var name	2020-02-19 17:37:52 -08:00
Ian Fijolek	162e8618cb	Revert "Don't copy extra qemu files" All checks were successful continuous-integration/drone/push Build is passing Details This reverts commit `5b69eacdd5`.	2020-01-30 11:41:34 -08:00
Ian Fijolek	c67fe1f4c7	Go back to copying all files because drone doesn't like this Some checks failed continuous-integration/drone/push Build is failing Details	2020-01-30 11:35:59 -08:00
Ian Fijolek	5b69eacdd5	Don't copy extra qemu files Some checks failed continuous-integration/drone/push Build is failing Details	2020-01-30 11:30:13 -08:00
Ian Fijolek	d6b979f06e	Update README to correct typo and checklist All checks were successful continuous-integration/drone/push Build is passing Details	2020-01-17 15:53:37 -08:00
Ian Fijolek	f4a972747f	Add notify after docker builds All checks were successful continuous-integration/drone/tag Build is passing Details	2020-01-10 14:25:02 -08:00
Ian Fijolek	c7c82fabe8	Add qemu binaries All checks were successful continuous-integration/drone/push Build is passing Details	2020-01-10 14:21:48 -08:00
Ian Fijolek	f807caa1ad	Add multi-arch builds Some checks failed continuous-integration/drone/push Build is failing Details	2020-01-10 13:58:17 -08:00
Ian Fijolek	3226be69e7	Fix issue with shell commands containing "<>" and unecessary (and poor) escaping All checks were successful continuous-integration/drone/push Build is passing Details	2020-01-07 10:37:53 -08:00
Ian Fijolek	0269ad3512	Add new test for multi-line YAML strings	2020-01-07 10:28:14 -08:00
Ian Fijolek	f6ccd9a3bd	Update Dockerfiles to newer (roughly) pinned versions All checks were successful continuous-integration/drone/push Build is passing Details	2019-11-22 14:44:21 -08:00
Ian Fijolek	f463ef27b7	Update Dockerfiles to make this version runnable Some checks failed continuous-integration/drone/push Build is failing Details Should now have pairity in terms of system utilities and scripts for checking services	2019-11-22 12:58:26 -08:00
Ian Fijolek	76ae8f3a44	Do build and test in one step All checks were successful continuous-integration/drone/push Build is passing Details Speed up build time by moving these two tasks to one step so that a new container doesn't have to be spun up and the cached modules from the build step are reused in the test step.	2019-11-21 15:40:59 -08:00
Ian Fijolek	9b9f803231	Add pre-commit to the repo All checks were successful continuous-integration/drone/push Build is passing Details This adds pre-commit which can be used to enforce consistent style and common errors (like committing large files)	2019-11-21 15:32:57 -08:00
Ian Fijolek	b808df7365	Update README to indicate where to get alert template info All checks were successful continuous-integration/drone/push Build is passing Details	2019-11-20 17:21:48 -08:00
Ian Fijolek	b1422bbec2	Add split out metrics to a new make target All checks were successful continuous-integration/drone/push Build is passing Details In case trying to run without having an available port to serve http on	2019-11-15 17:36:10 -08:00
Ian Fijolek	604c27118a	Add Docker deploy pipeline All checks were successful continuous-integration/drone/push Build is passing Details	2019-11-15 17:30:29 -08:00
Ian Fijolek	b2d9882c91	Update readme with accurate To do status All checks were successful continuous-integration/drone/push Build is passing Details	2019-11-15 17:17:46 -08:00
Ian Fijolek	457e19af9b	Add prometheus metrics exporter This should add metrics parity to the Python version	2019-11-15 17:14:20 -08:00