[argocd-notifications] add monitoring and slack bot service annotations (#411)

* feat: add slack bot service annotations to argocd-notifications

* feat: add monitoring to argocd-notifications

charts/argocd-notifications/templates/servicemonitor.yaml

@@ -0,0 +1,30 @@
+{{- if and .Values.metrics.enabled .Values.metrics.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "argocd-notifications.name" . }}-metrics
+  {{- if .Values.metrics.serviceMonitor.namespace }}
+  namespace: {{ .Values.metrics.serviceMonitor.namespace }}
+  {{- end }}
+  labels:
+    {{- include "argocd-notifications.metrics.labels" . | nindent 4 }}
+    {{- if .Values.metrics.serviceMonitor.additionalLabels }}
+      {{- toYaml .Values.metrics.serviceMonitor.additionalLabels | nindent 4 }}
+    {{- end }}
+spec:
+  endpoints:
+    - port: metrics
+      path: /metrics
+      {{- if .Values.metrics.serviceMonitor.interval }}
+      interval: {{ .Values.metrics.serviceMonitor.interval }}
+      {{- end }}
+      {{- if .Values.metrics.serviceMonitor.scrapeTimeout }}
+      scrapeTimeout: {{ .Values.metrics.serviceMonitor.scrapeTimeout }}
+      {{- end }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+  selector:
+    matchLabels:
+      {{- include "argocd-notifications.metrics.selectorLabels" . | nindent 6 }}
+{{- end }}