Merge pull request #18244 from mrsiano/nodexporter

Automatic merge from submit-queue.

node selector annotation for any label.

this patch will let the node exporter pods to run on any node
by any label.

In continuing to #17645 #17639

Author: openshift-merge-robot

examples/prometheus/README.md

@@ -22,6 +22,7 @@ To deploy, run:
 ```
 $ oc create -f node-exporter.yaml -n kube-system
 $ oc adm policy add-scc-to-user -z prometheus-node-exporter -n kube-system hostaccess
+$ oc annotate ns kube-system openshift.io/node-selector= --overwrite
 ```
 
 ## Standalone Prometheus