node selector annotation for any label.
this patch will let the node exporter pods to run on any node
by any label.
@@ -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
