feat(argo-cd): Add ability to scrape redis metrics (#892)

* feat(argo-cd): Add ability to scrape redis metrics

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Bump chart version

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argo-cd/templates/redis/servicemonitor.yaml

@@ -0,0 +1,39 @@
+{{- $redisHa := (index .Values "redis-ha") -}}
+{{- if and .Values.redis.enabled (not $redisHa.enabled) .Values.redis.metrics.enabled .Values.redis.metrics.serviceMonitor.enabled -}}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ template "argo-cd.redis.fullname" . }}
+  {{- with .Values.redis.metrics.serviceMonitor.namespace }}
+  namespace: {{ . }}
+  {{- end }}
+  labels:
+    {{- include "argo-cd.labels" (dict "context" . "component" .Values.redis.name "name" .Values.redis.name) | nindent 4 }}
+    {{- with .Values.redis.metrics.serviceMonitor.selector }}
+      {{- toYaml . | nindent 4 }}
+    {{- end }}
+    {{- with .Values.redis.metrics.serviceMonitor.additionalLabels }}
+      {{- toYaml . | nindent 4 }}
+    {{- end }}
+spec:
+  endpoints:
+    - port: {{ .Values.redis.metrics.service.portName }}
+      {{- with .Values.redis.metrics.serviceMonitor.interval }}
+      interval: {{ . }}
+      {{- end }}
+      path: /metrics
+      {{- with .Values.redis.metrics.serviceMonitor.relabelings }}
+      relabelings:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.redis.metrics.serviceMonitor.metricRelabelings }}
+      metricRelabelings:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+  selector:
+    matchLabels:
+      {{- include "argo-cd.selectorLabels" (dict "context" . "component" .Values.redis.name "name" .Values.redis.name) | nindent 6 }}
+{{- end }}