prometheus: build metric names from the project name

templates/server/initPrometheus.gotmpl

@@ -4,6 +4,7 @@
 {{ $package := .Package }}
 
 import (
+	"github.com/prometheus/client_golang/prometheus"
   {{ range $key, $value := .Imports }}{{ $key }} {{ printf "%q" $value }}
   {{ end }}
 )
@@ -15,3 +16,18 @@
         {{.ReceiverName}}.handlers[{{ printf "%q" (upper .Method) }}][{{ if eq .Path "/" }}""{{ else }}{{ printf "%q" (cleanPath .Path) }}{{ end }}])
     {{end}}
 }
+
+func init() {
+    reg := prometheus.WrapRegistererWith(prometheus.Labels{
+        "api_name": "{{ .Name }}",
+        "api_title": "{{ .Info.Title }}",
+        "api_version": "{{ .Info.Version }}",
+    }, prometheus.DefaultRegisterer)
+
+    {{range .Operations}}
+    reg.MustRegister(
+        {{if ne .Package $package}}{{.Package}}.{{end}}{{ camelize .Name }}HandlerDuration,
+        {{if ne .Package $package}}{{.Package}}.{{end}}{{ camelize .Name }}HandlerInFlight,
+    )
+    {{end}}
+}

templates/server/prometheus.gotmpl

-// Code generated by go-swagger with a alpe-api template; DO NOT EDIT.
+// Code generated by go-swagger with a go-orusapi template; DO NOT EDIT.
 
 // Copyright Orus.io team
 
@@ -12,5 +12,5 @@
 var (
     {{ camelize .Name }}HandlerDuration = prometheus.NewSummaryVec(
         prometheus.SummaryOpts{
-            Name: "alpe_api_handler",
+            Name: "orus_api_handler",
             Help: "The handlers duration and count.",
@@ -16,4 +16,4 @@
             Help: "The handlers duration and count.",
-			Objectives: map[float64]float64{0.9: 0.01, 0.95: 0.01, 0.99: 0.001},
+            Objectives: map[float64]float64{0.9: 0.01, 0.95: 0.01, 0.99: 0.001},
             ConstLabels: map[string]string{
                 "service": "{{.Name}}",
@@ -18,5 +18,8 @@
             ConstLabels: map[string]string{
                 "service": "{{.Name}}",
+{{- if .Tags }}
+                "tag": "{{ .Tags }}",
+{{- end }}
             },
         },
         []string{"code"},
@@ -24,7 +27,7 @@
 
     {{ camelize .Name }}HandlerInFlight = prometheus.NewGauge(
         prometheus.GaugeOpts{
-            Name: "alpe_api_handler_in_flights",
+            Name: "orus_api_handler_in_flignts",
             Help: "The number of handlers currently running.",
             ConstLabels: map[string]string{
                 "service": "{{.Name}}",
@@ -28,6 +31,9 @@
             Help: "The number of handlers currently running.",
             ConstLabels: map[string]string{
                 "service": "{{.Name}}",
+{{- if .Tags }}
+                "tag": "{{ .Tags }}",
+{{- end }}
             },
         },
     )
@@ -40,10 +46,3 @@
         ),
     )
 }
-
-func init() {
-    prometheus.MustRegister(
-        {{ camelize .Name }}HandlerDuration,
-        {{ camelize .Name }}HandlerInFlight,
-    )
-}