Enable the errcheck linter. Update the way we express exclusions to use
the new, non-deprecated, non-regex-based format. Fix all places where we
began accidentally violating errcheck while it was disabled.
Upgrade grpc to v1.53.0, as preparation for introducing OpenTelemetry,
which depends on that grpc version.
Two changes to our own code were necessitated by upstream changes:
1. Add a stub implementation of GetOrBuildProducer: this was added to
the balancer.SubConn interface by grpc v1.51.0
2. Change use of Endpoint field to Endpoint() method: the field was
removed and replaced by a method in
https://github.com/grpc/grpc-go/pull/5852. This also means that our
tests can't set the .Endpoint field, so the tests are updated to use the
.URL field instead, and a helper has been added to make that easy.
Part of #6361
- Implement a static resolver for the gPRC dialer under the scheme `static:///`
which allows the dialer to resolve a backend from a static list of IPv4/IPv6
addresses passed via the existing JSON config.
- Add config key `serverAddresses` to the `GRPCClientConfig` which, when
populated, enables static IP resolution of gRPC server backends.
- Set `config-next` to use static gRPC backend resolution for all SA clients.
- Generate a new SA certificate which adds `10.77.77.77` and `10.88.88.88` to
the SANs.
Resolves#6255
James Renken
Aaron Gable
Matthew McPherrin
Samantha