Compatibility with Grafana Cloud

[jorgelbg]

Now that Grafana Cloud has a very generous free tier deploying your own Loki instance is no longer needed.

To make it easier we need to verify that the integration works as expected and also we should include instructions on how to set it up. Perhaps using Grafana Cloud should be the default path for testing.

[jorgelbg]

Grafana Cloud uses basic authentication as the login, we get a userId and an API key that has to be generated with the MetricsPublisher role.