From 457e19af9bc6e61c328b550fec9ce49a78a6065d Mon Sep 17 00:00:00 2001 From: Ian Fijolek Date: Fri, 15 Nov 2019 11:25:21 -0800 Subject: [PATCH] Add prometheus metrics exporter This should add metrics parity to the Python version --- Makefile | 6 ++-- config.go | 4 ++- go.mod | 5 ++- go.sum | 75 +++++++++++++++++++++++++++++++++++++++ main.go | 27 ++++++++++++-- metrics.go | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 211 insertions(+), 7 deletions(-) create mode 100644 metrics.go diff --git a/Makefile b/Makefile index c03eadb..7a0d4da 100644 --- a/Makefile +++ b/Makefile @@ -1,6 +1,7 @@ +.PHONY: all DOCKER_TAG ?= minitor-go-${USER} -.PHONY: test +.PHONY: default default: test .PHONY: build @@ -12,7 +13,7 @@ minitor-go: .PHONY: run run: minitor-go build - ./minitor-go -debug + ./minitor-go -debug -metrics .PHONY: test test: @@ -24,7 +25,6 @@ test: @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; } }' - .PHONY: clean clean: rm -f ./minitor-go diff --git a/config.go b/config.go index ad348aa..e48f0aa 100644 --- a/config.go +++ b/config.go @@ -84,7 +84,9 @@ func LoadConfig(filePath string) (config Config, err error) { return } - log.Printf("config:\n%v\n", config) + if LogDebug { + log.Printf("DEBUG: Config values:\n%v\n", config) + } if !config.IsValid() { err = errors.New("Invalid configuration") diff --git a/go.mod b/go.mod index 1008de3..dac2c9d 100644 --- a/go.mod +++ b/go.mod @@ -2,4 +2,7 @@ module git.iamthefij.com/iamthefij/minitor-go go 1.12 -require gopkg.in/yaml.v2 v2.2.4 +require ( + github.com/prometheus/client_golang v1.2.1 + gopkg.in/yaml.v2 v2.2.4 +) diff --git a/go.sum b/go.sum index 3e79157..8980eef 100644 --- a/go.sum +++ b/go.sum @@ -1,3 +1,78 @@ +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= 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v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= +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 v2.2.1/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 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I= gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= diff --git a/main.go b/main.go index d096fd6..27b894c 100644 --- a/main.go +++ b/main.go @@ -11,6 +11,13 @@ var ( // LogDebug will control whether debug messsages should be logged LogDebug = false + // ExportMetrics will track whether or not we want to export metrics to prometheus + ExportMetrics = false + // MetricsPort is the port to expose metrics on + MetricsPort = 8080 + // Metrics contains all active metrics + Metrics = NewMetrics() + // version of minitor being run version = "dev" ) @@ -18,7 +25,13 @@ var ( func checkMonitors(config *Config) error { for _, monitor := range config.Monitors { if monitor.ShouldCheck() { - _, alertNotice := monitor.Check() + success, alertNotice := monitor.Check() + + hasAlert := alertNotice != nil + + // Track status metrics + Metrics.SetMonitorStatus(monitor.Name, success) + Metrics.CountCheck(monitor.Name, success, hasAlert) // Should probably consider refactoring everything below here if alertNotice != nil { @@ -50,6 +63,9 @@ func checkMonitors(config *Config) error { 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) @@ -66,12 +82,13 @@ func checkMonitors(config *Config) error { func main() { // Get debug flag flag.BoolVar(&LogDebug, "debug", false, "Enables debug logs (default: false)") + flag.BoolVar(&ExportMetrics, "metrics", false, "Enables prometheus metrics exporting (default: false)") var showVersion = flag.Bool("version", false, "Display the version of minitor and exit") flag.Parse() // Print version if flag is provided if *showVersion { - fmt.Println("Minitor version:", version) + log.Println("Minitor version:", version) return } @@ -81,6 +98,12 @@ func main() { log.Fatalf("Error loading config: %v", err) } + // Serve metrics exporter, if specified + if ExportMetrics { + log.Println("INFO: Exporting metrics to Prometheus") + go ServeMetrics() + } + // Start main loop for { err = checkMonitors(&config) diff --git a/metrics.go b/metrics.go new file mode 100644 index 0000000..d4c3694 --- /dev/null +++ b/metrics.go @@ -0,0 +1,101 @@ +package main + +import ( + "fmt" + "github.com/prometheus/client_golang/prometheus" + // "github.com/prometheus/client_golang/prometheus/promauto" + "github.com/prometheus/client_golang/prometheus/promhttp" + "net/http" +) + +// 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 + 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"}, + ), + 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.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, 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() +} + +// 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) +}