Document URL: 
https://docs.openshift.com/container-platform/4.9/monitoring/configuring-the-monitoring-stack.html#configuring_remote_write_storage_configuring-the-monitoring-stack

Section Number and Name: 
Point 4 under "Configuring remote write storage"

Describe the issue: 

The sample configuration in the above-mentioned section for adding write relabel configuration values in cluster-monitoring-config is as below:
 
      remoteWrite:
      - url: "https://remote-write.endpoint"
        writeRelabelConfigs:
        - source_labels: [__name__]
          regex: 'my_metric'
          action: keep

Here "source_labels" is wrong (It should be "sourceLabels").
Configuring remote write in this way would result in regex not being able to match as the prometheus config resulting from this cm would be:


$ oc exec  -n openshift-monitoring pod/prometheus-k8s-1 cat /etc/prometheus/config_out/prometheus.env.yaml

remote_write:
- url: https://remote-write.endpoint
  remote_timeout: 30s
  write_relabel_configs:
  - regex: my_metric           <----- no source label to match
    action: keep
	
when it should be: 

remote_write:
- url: https://remote-write.endpoint
  remote_timeout: 30s
  write_relabel_configs:
  - source_labels:
    - __name__
    regex: my_metric
    action: keep

Suggestions for improvement: 

 Change "source_labels" to "sourceLabels" in the document.


Version-Release number of selected component (if applicable):

4.9 

How reproducible:

100% 

Steps to Reproduce:
1. Configure remoteWrite as in doc with writeRelabelConfigs

Actual results:
Regex does not match.

$ oc exec  -n openshift-monitoring pod/prometheus-k8s-1 cat /etc/prometheus/config_out/prometheus.env.yaml

remote_write:
- url: https://remote-write.endpoint
  remote_timeout: 30s
  write_relabel_configs:
  - regex: my_metric           <----- no source label to match
    action: keep

Expected results:
Regex should match.

$ oc exec  -n openshift-monitoring pod/prometheus-k8s-1 cat /etc/prometheus/config_out/prometheus.env.yaml


remote_write:
- url: https://remote-write.endpoint
  remote_timeout: 30s
  write_relabel_configs:
  - source_labels:
    - __name__
    regex: my_metric