[stable/nginx-ingress] Add debug snippet for ingress controller to readme (#4153)

* Add debug snippet for ingress controller to readme

* Bump version

stable/nginx-ingress/Chart.yaml

@@ -1,5 +1,5 @@
 name: nginx-ingress
-version: 0.11.2
+version: 0.11.3
 appVersion: 0.11.0
 description: An nginx Ingress controller that uses ConfigMap to store the nginx configuration.
 icon: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Nginx_logo.svg/500px-Nginx_logo.svg.png

stable/nginx-ingress/README.md

@@ -147,6 +147,13 @@ Alternatively, a YAML file that specifies the values for the parameters can be p
 $ helm install stable/nginx-ingress --name my-release -f values.yaml
 ```
 
+A useful trick to debug issues with ingress is to increase the logLevel
+as described [here](https://github.com/kubernetes/ingress-nginx/blob/master/docs/troubleshooting.md#debug)
+
+```console
+$ helm install stable/nginx-ingress --set controller.extraArgs.v=2
+```
+
 ## Prometheus Metrics
 
 The Nginx ingress controller can export Prometheus metrics. In order for this to work, the VTS dashboard must be enabled as well.