Patch to demonstrate addition of Prometheus metrics endpoint

mariadb-metrics-support.patch

# git clone https://github.com/kubernetes/charts
# cd charts
# curl -sSL https://git.io/vQIyP > mariadb-metrics-support.patch
# patch -Np1 -i mariadb-metrics-support.patch
# helm install stable/mariadb
diff --git a/stable/mariadb/templates/deployment.yaml b/stable/mariadb/templates/deployment.yaml
index ac3f7a1..3f8cd12 100644
--- a/stable/mariadb/templates/deployment.yaml
+++ b/stable/mariadb/templates/deployment.yaml
@@ -73,6 +73,15 @@ spec:
           timeoutSeconds: 1
         resources:
 {{ toYaml .Values.resources | indent 10 }}
+      - name: metrics
+        image: "prom/mysqld-exporter:v0.10.0"
+        imagePullPolicy: "IfNotPresent"
+        env:
+        - name: DATA_SOURCE_NAME
+          value: "root:{{ .Values.mariadbRootPassword }}@(localhost:3306)/"
+        ports:
+        - name: metrics
+          containerPort: 9104
         volumeMounts:
         - name: data
           mountPath: /bitnami/mariadb
diff --git a/stable/mariadb/templates/svc.yaml b/stable/mariadb/templates/svc.yaml
index 8a67c3c..ebaa407 100644
--- a/stable/mariadb/templates/svc.yaml
+++ b/stable/mariadb/templates/svc.yaml
@@ -7,6 +7,9 @@ metadata:
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
     release: "{{ .Release.Name }}"
     heritage: "{{ .Release.Service }}"
+  annotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "9104"
 spec:
   type: {{ .Values.serviceType }}
   ports: