Prometheus write_relabel_configs in remotewrite unable to drop metric in Grafana  

 Customer has tried both configurations to drop MQ metric with source_label(configuration 1) or without source_label(configuration 2) but it's not working.

It seems to me that  drop configuration is not working properly and is buggy. 


Configuration 1:

```
 remoteWrite:
        - url: "https://prometheus-prod-01-eu-west-0.grafana.net/api/prom/push"
          write_relabel_configs:
          - source_labels: ['__name__']
            regex: 'ibmmq_qmgr_uptime'
            action: 'drop'
          basicAuth:
            username:
              name: kubepromsecret
              key: username
            password:
              name: kubepromsecret
              key: password
```

Configuration 2:
```
remoteWrite:
        - url: "https://prometheus-prod-01-eu-west-0.grafana.net/api/prom/push"
          write_relabel_configs:
          - regex: 'ibmmq_qmgr_uptime'
            action: 'drop'
          basicAuth:
            username:
              name: kubepromsecret
              key: username
            password:
              name: kubepromsecret
              key: password
```


Customer wants to know what's the correct remote_write configuration to drop metric in Grafana ?

Document links:
https://prometheus.io/docs/prometheus/latest/configuration/configuration/#remote_write
https://docs.openshift.com/container-platform/4.14/observability/monitoring/configuring-the-monitoring-stack.html#configuring-remote-write-storage_configuring-the-monitoring-stack
https://docs.openshift.com/container-platform/4.14/observability/monitoring/configuring-the-monitoring-stack.html#creating-user-defined-workload-monitoring-configmap_configuring-the-monitoring-stack

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    prometheus remote_write configurations NOT droppping metric in Grafana   

prometheus  remote_write configurations should drop metric in Grafana