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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -18,6 +18,7 @@ server/src/coverage.txt | |
| build | ||
| server/src/main | ||
| server/src/server | ||
| server/src/tmp | ||
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| # misc | ||
| .DS_Store | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| apiVersion: 1 | ||
| datasources: | ||
| - name: Main | ||
| type: prometheus | ||
| url: http://prometheus:9090 | ||
| isDefault: true |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,15 @@ | ||
| global: | ||
| scrape_interval: 15s # By default, scrape targets every 15 seconds. | ||
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| scrape_configs: | ||
| - job_name: 'scrumlr-api' | ||
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| # Override the global default and scrape targets from this job every 5 seconds. | ||
| scrape_interval: 5s | ||
| scrape_timeout: 5s | ||
| metrics_path: /metrics | ||
| scheme: http | ||
| follow_redirects: true | ||
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| static_configs: | ||
| - targets: ['host.docker.internal:8080'] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package api | ||
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| import ( | ||
| "context" | ||
| "net/http" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
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| "github.com/go-chi/chi/middleware" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "scrumlr.io/server/logger" | ||
| ) | ||
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| var ( | ||
| endpointLatency = prometheus.NewHistogramVec( | ||
| prometheus.HistogramOpts{ | ||
| Name: "http_request_duration_seconds", | ||
| Help: "HTTP request latency per endpoint.", | ||
| Buckets: []float64{0.1, 0.2, 0.5, 1, 3, 5, 10}, | ||
| }, | ||
| []string{"method", "route", "status"}, | ||
| ) | ||
| requestCounter = prometheus.NewCounterVec( | ||
| prometheus.CounterOpts{ | ||
| Name: "http_request_counter", | ||
| Help: "Counter of HTTP requests", | ||
| }, []string{"method", "route", "status"}, | ||
| ) | ||
| ) | ||
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| func (s *Server) initMetrics() { | ||
| log := logger.FromContext(context.Background()) | ||
| err := s.customMetrics.RegisterCounterVec(requestCounter) | ||
| if err != nil { | ||
| log.Errorw("unable to register counter for custom metrics", err) | ||
| } | ||
| err = s.customMetrics.RegisterHistogramVec(endpointLatency) | ||
| if err != nil { | ||
| log.Errorw("unable to register histogram for custom metrics", err) | ||
| } | ||
| } | ||
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| func metricCounterMiddleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor) | ||
| defer func() { | ||
| urlPath := generalizeURLPath(r.URL.Path) | ||
| requestCounter.WithLabelValues(r.Method, urlPath, strconv.Itoa(ww.Status())).Inc() | ||
| }() | ||
| next.ServeHTTP(ww, r) | ||
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| }) | ||
| } | ||
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| func metricMeasureLatencyMiddleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| start := time.Now() | ||
| ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor) | ||
| defer func() { | ||
| duration := time.Since(start).Seconds() | ||
| urlPath := generalizeURLPath(r.URL.Path) | ||
| endpointLatency.WithLabelValues(r.Method, urlPath, strconv.Itoa(ww.Status())).Observe(duration) | ||
| }() | ||
| next.ServeHTTP(ww, r) | ||
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| }) | ||
| } | ||
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| // Replaces UUID-like segments with a wildcard placeholder | ||
| func generalizeURLPath(path string) string { | ||
| segments := strings.Split(path, "/") | ||
| for i, segment := range segments { | ||
| if len(segment) == 36 && strings.Contains(segment, "-") { | ||
| segments[i] = "*" | ||
| } | ||
| } | ||
| return strings.Join(segments, "/") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package custom_metrics | ||
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| import ( | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/collectors" | ||
| "scrumlr.io/server/services" | ||
| ) | ||
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| type CustomMetricService struct { | ||
| registry prometheus.Registry | ||
| } | ||
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| func NewCustomMetricService(enabled bool) services.CustomMetrics { | ||
| if enabled { | ||
| m := &CustomMetricService{} | ||
| m.registry = *prometheus.NewRegistry() | ||
| m.registry.Unregister(collectors.NewGoCollector()) // Unregister the default bloat of metrics | ||
| return m | ||
| } | ||
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| return nil | ||
| } | ||
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| func (cms *CustomMetricService) RegisterHistogramVec(histo *prometheus.HistogramVec) error { | ||
| return cms.registry.Register(histo) | ||
| } | ||
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| func (cms *CustomMetricService) RegisterCounterVec(ctr *prometheus.CounterVec) error { | ||
| return cms.registry.Register(ctr) | ||
| } | ||
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| func (cms *CustomMetricService) Registry() *prometheus.Registry { | ||
| return &cms.registry | ||
| } |
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