Stackdriver LoggingAppender is missing container_name and namespace_id fields on MonitoredResource #3559
Description
I added the 0.57.0-alpha LoggingAppender to my logback config in a GKE service, however I noticed that the fields container_name and namespace_id are missing. This is important, because in the GKE UI, when clicking on "Container logs" for a given container, the filter is pre-populated with these fields (resource.labels.container_name, etc), and therefor no logs will show up unless those are populated.
It looks like MonitoredResourceUtil from google-cloud-logging just needs to be enhanced to pick up these fields if running in GKE.