feat: add namespace selector for ServiceMonitor (#135)

Signed-off-by: Aris Boutselis <arisboutselis08@gmail.com>
Co-authored-by: Aris Boutselis <arisboutselis08@gmail.com>

chart/operator/templates/_helpers.tpl

@@ -60,3 +60,10 @@ Create the name of the service account to use
 {{- default "default" .Values.serviceAccount.name }}
 {{- end }}
 {{- end }}
+
+{{/*
+Create the name of the service account to use.
+*/}}
+{{- define "k8sgpt-operator.namespace" -}}
+{{- default .Release.Namespace }}
+{{- end }}

chart/operator/templates/controller-manager-metrics-monitor.yaml

@@ -3,6 +3,7 @@ apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
 metadata:
   name: {{ include "chart.fullname" . }}-controller-manager-metrics-monitor
+  namespace: {{ .Values.serviceMonitor.namespace | default (include "k8sgpt-operator.namespace" . ) }}
   labels:
     app.kubernetes.io/component: metrics
     app.kubernetes.io/created-by: k8sgpt-operator
@@ -13,6 +14,11 @@ metadata:
     {{- toYaml .Values.serviceMonitor.additionalLabels | nindent 4 }}
   {{- end }}
 spec:
+  {{- if .Values.serviceMonitor.namespace }}
+  namespaceSelector:
+    matchNames:
+    - {{ include "k8sgpt-operator.namespace" . }}
+  {{- end }}
   endpoints:
   - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
     path: /metrics
@@ -23,4 +29,4 @@ spec:
   selector:
     matchLabels:
       control-plane: controller-manager
-{{ end -}}
+{{ end -}}

chart/operator/values.yaml

@@ -1,6 +1,8 @@
 serviceMonitor:
   enabled: false
   additionalLabels: {}
+  # The namespace where Prometheus expects to find the serviceMonitor
+  # namespace: ""
 grafanaDashboard:
   enabled: false
   folder: