Add liveness and readiness probes to Grafana

* https://github.com/grafana/grafana/issues/3302

addons/prometheus/deployment.yaml

@@ -39,18 +39,18 @@ spec:
               mountPath: /etc/prometheus/rules
             - name: data
               mountPath: /var/lib/prometheus
-          readinessProbe:
-            httpGet:
-              path: /-/ready
-              port: 9090
-            initialDelaySeconds: 10
-            timeoutSeconds: 10
           livenessProbe:
             httpGet:
               path: /-/healthy
               port: 9090
             initialDelaySeconds: 10
             timeoutSeconds: 10
+          readinessProbe:
+            httpGet:
+              path: /-/ready
+              port: 9090
+            initialDelaySeconds: 10
+            timeoutSeconds: 10
       terminationGracePeriodSeconds: 30
       volumes:
         - name: config