GCP Authentication Filter
This filter is used to fetch authentication tokens from GCP compute metadata server(https://cloud.google.com/run/docs/securing/service-identity#identity_tokens). In multiple services architecture where these services likely need to communicate withe each other, authenticating service-to-service(https://cloud.google.com/run/docs/authenticating/service-to-service) is required because many of these services may be private and require credentials for access.
Configuration
This filter should be configured with the type URL
type.googleapis.com/envoy.extensions.filters.http.gcp_authn.v3.GcpAuthnFilterConfig.