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replace go-gin-prometheus for better control over metrics
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package metrics | ||
|
|
||
| import ( | ||
| "strconv" | ||
| "time" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| ) | ||
|
|
||
| var ( | ||
| apiLatencySec *prometheus.HistogramVec | ||
| dbErrorCount *prometheus.CounterVec | ||
| ) | ||
|
|
||
| const ( | ||
| appName = "fleetdb" | ||
| apiSub = "api" | ||
| dbSub = "database" | ||
| ) | ||
|
|
||
| func init() { | ||
| apiLatencySec = promauto.NewHistogramVec( | ||
| prometheus.HistogramOpts{ | ||
| Namespace: appName, | ||
| Subsystem: apiSub, | ||
| Name: "latency_seconds", | ||
| Help: "api latency measurements in seconds", | ||
| // XXX: These buckets will likely need some tuning | ||
| Buckets: []float64{0.025, 0.05, 0.1, 0.25, 0.5, 0.75, 1.0, 2.5, 5.0, 7.5, 10.0, 15.0, 20.0}, | ||
| }, | ||
| []string{ | ||
| "code", | ||
| "endpoint", | ||
| }, | ||
| ) | ||
|
|
||
| dbErrorCount = promauto.NewCounterVec( | ||
| prometheus.CounterOpts{ | ||
| Namespace: appName, | ||
| Subsystem: dbSub, | ||
| Name: "error_count", | ||
| Help: "total count of database errors", | ||
| }, | ||
| []string{ | ||
| "operation", | ||
| }, | ||
| ) | ||
| } | ||
|
|
||
| // APICallEpilog observes the response and elapsed time of a call to a given endpoint | ||
| func APICallEpilog(start time.Time, endpoint string, responseCode int) { | ||
| code := strconv.Itoa(responseCode) | ||
| elapsed := time.Since(start).Seconds() | ||
| apiLatencySec.WithLabelValues(endpoint, code).Observe(elapsed) | ||
| } | ||
|
|
||
| // DBError observes errors arising from an attempt to read or write data to the remote database | ||
| func DBError(op string) { | ||
| dbErrorCount.WithLabelValues(op).Inc() | ||
| } |