[stable/grafana] change default readinessProbe to /api/health (#3343)

* [stable/grafana] change default readinessProbe to /api/health

accessing to `/login` generates session file each time, while
`/api/health` doesn't.

See: https://github.com/grafana/grafana/issues/3824

* [stable/grafana] increment chart version to 0.5.6

stable/grafana/Chart.yaml

@@ -1,5 +1,5 @@
 name: grafana
-version: 0.6.1
+version: 0.6.2
 description: The leading tool for querying and visualizing time series and metrics.
 home: https://grafana.net
 icon: https://raw.githubusercontent.com/grafana/grafana/master/public/img/logo_transparent_400x.png

stable/grafana/README.md

@@ -40,7 +40,7 @@ The command removes all the Kubernetes components associated with the chart and
 | `server.persistentVolume.accessMode`      | ReadWriteOnce or ReadOnly           | [ReadWriteOnce]                                   |
 | `server.persistentVolume.existingClaim`   | Existing persistent volume claim    | null                                              |
 | `server.persistentVolume.subPath`         | Subdirectory of pvc to mount        | null                                              |
-| `server.readinessProbe`                   | Server readiness probe              | httpGet: {path: /login, port: 3000}, initialDelaySeconds: 30, timeoutSeconds: 30 |
+| `server.readinessProbe`                   | Server readiness probe              | httpGet: {path: /api/health, port: 3000}, initialDelaySeconds: 30, timeoutSeconds: 30 |
 | `server.resources`                        | Server resource requests and limits | requests: {cpu: 100m, memory: 100Mi}              |
 | `server.tolerations`                      | node taints to tolerate (requires Kubernetes >=1.6) | null |
 | `server.service.annotations`              | Service annotations                 | null                                              |

stable/grafana/values.yaml

@@ -114,7 +114,7 @@ server:
   ##
   readinessProbe:
     httpGet:
-      path: /login
+      path: /api/health
       port: 3000
     initialDelaySeconds: 30
     timeoutSeconds: 30