- Configure all gRPC clients to check the overall serving status of each
endpoint via the `grpc_health_v1` service.
- Configure all gRPC servers to expose the `grpc_health_v1` service to
any client permitted to access one of the server’s services.
- Modify long-running, deep health checks to set and transition the
overall (empty string) health status of the gRPC server in addition to
the specific service they were configured for.
Fixes#8227
Add the necessary scaffolding for deep health checking of our various
gRPC components. Each component implementation that also implements the
grpc.checker interface will be checked periodically, and the health
status of the component will be updated accordingly.
Add the necessary methods to SA to implement the grpc.checker interface
and register these new health checks with Consul.
Additionally:
- Update entry point script to check for ProxySQL readiness.
- Increase the poll rate for gRPC Consul checks from 5s to 2s to help
with DNS failures, due to check failures, on startup.
- Change log level for Consul from INFO to ERROR to deal with noisy logs
full of transport failures due to Consul gRPC checks firing before the
SAs are up.
Fixes#6878
Part of #6795
Samantha Frank