executors: Add new worker prometheus scrape target (#147)

This adds a scrape config for a new port exposed by the worker service that serves the collected executor metrics.

Author: eseliger

charts/sourcegraph/templates/worker/worker-executors.Service.yaml

@@ -0,0 +1,26 @@
+apiVersion: v1
+kind: Service
+metadata:
+  annotations:
+    prometheus.io/port: "6996"
+    sourcegraph.prometheus/scrape: "true"
+    {{- if .Values.worker.serviceAnnotations }}
+    {{- toYaml .Values.worker.serviceAnnotations | nindent 4 }}
+    {{- end }}
+  labels:
+    app: worker
+    deploy: sourcegraph
+    app.kubernetes.io/component: worker
+    {{- if .Values.worker.serviceLabels }}
+      {{- toYaml .Values.worker.serviceLabels | nindent 4 }}
+    {{- end }}
+  name: worker-executors
+spec:
+  ports:
+  - name: prom
+    port: 6996
+    targetPort: prom
+  selector:
+    {{- include "sourcegraph.selectorLabels" . | nindent 4 }}
+    app: worker
+  type: {{ .Values.worker.serviceType | default "ClusterIP" }}

charts/sourcegraph/templates/worker/worker.Deployment.yaml

@@ -84,6 +84,8 @@ spec:
           name: http
         - containerPort: 6060
           name: debug
+        - containerPort: 6996
+          name: prom
         {{- if not .Values.sourcegraph.localDevMode }}
         resources:
           {{- toYaml .Values.worker.resources | nindent 10 }}