Logging on GKE has incorrect cluster ___location #1819
Description
Current logging value for resource.labels.___location is derived from compute ___location instead of GKE cluster ___location. This incorrect value causes us to see no container logs when clicked on "Container Logs" from GKE cluster console UI unless we explicitly remove resource.labels.___location filter each time when GKE cluster is regional but logs have ___location value as zonal.
This is fixed in python logging library: googleapis/python-logging#830 by moving to attribute instance/attributes/cluster-___location from metadata server.