[Feature] Metrics counter (#1333)

Author: ajanikow

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
 - (Feature) AgencyCache Interface
 - (Feature) Agency Cache Poll EE Extension
+- (Feature) Metrics Counter
 
 ## [1.2.29](https://github.com/arangodb/kube-arangodb/tree/1.2.29) (2023-06-08)
 - (Maintenance) Add govulncheck to pipeline, update golangci-linter

internal/metrics.item.go.tmpl

@@ -35,5 +35,5 @@ func {{ .ename }}() metrics.Description {
 }
 
 func {{ .ename }}{{ .type }}({{ .fparams }}) metrics.Metric {
-    return {{ .ename }}().Gauge({{ .fkeys }})
+    return {{ .ename }}().{{ .type }}({{ .fkeys }})
 }