feat(prometheus): add podMonitor and serviceMonitor

This patch adds Prometheus podMonitor and serviceMonitor.

templates/_serviceMonitors.tpl

@@ -0,0 +1,35 @@
+{{/* vim: set filetype=mustache: */}}
+
+{{/* annotations */}}
+
+{{- define "reposilite.serviceMonitor.annotations" -}}
+{{ include "reposilite.annotations" . }}
+{{- if .Values.prometheus.metrics.serviceMonitor.annotations }}
+{{ toYaml .Values.prometheus.metrics.serviceMonitor.annotations }}
+{{- end }}
+{{- end }}
+
+{{/* enabled */}}
+
+{{- define "reposilite.serviceMonitor.enabled" -}}
+{{- if and .Values.prometheus.metrics.enabled (not .Values.prometheus.metrics.podMonitor.enabled) .Values.prometheus.metrics.serviceMonitor.enabled .Values.service.enabled -}}
+true
+{{- else -}}
+false
+{{- end -}}
+{{- end }}
+
+{{/* labels */}}
+
+{{- define "reposilite.serviceMonitor.labels" -}}
+{{ include "reposilite.labels" . }}
+{{- if .Values.prometheus.metrics.serviceMonitor.labels }}
+{{ toYaml .Values.prometheus.metrics.serviceMonitor.labels }}
+{{- end }}
+{{- end }}
+
+{{- define "reposilite.serviceMonitor.selectorLabels" -}}
+{{ include "reposilite.selectorLabels" . }}
+{{/* Add label to select the correct service via `selector.matchLabels` of the serviceMonitor resource. */}}
+app.kubernetes.io/service-name: http
+{{- end }}