add support for deploymentLabels

Signed-off-by: quintonm <[email protected]>

docs/gitbook/install/flagger-install-on-kubernetes.md

@@ -83,6 +83,18 @@ $ helm upgrade -i flagger flagger/flagger \
 
 You can install Flagger in any namespace as long as it can talk to the Prometheus service on port 9090.
 
+If you need to add labels to the flagger deployment or pods, you can pass the labels as parameters as shown below.
+
+```bash
+helm upgrade -i flagger flagger/flagger \
+--namespace=<namespace> \
+--set crd.create=false \
+--set meshProvider=<provider>> \
+--set metricsServer=<metricServer> \
+--set podLabels.<labelName>=<labelValue> \
+--set deploymentLabels.<labelName>=<labelValue> 
+```
+
 For ingress controllers, the install instructions are:
 
 * [Contour](https://docs.flagger.app/tutorials/contour-progressive-delivery)