metrics: measure rate of RPC requests that serve API #15876
Merged
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This changeset configures the RPC rate metrics that were added in #15515 to all the RPCs that support authenticated HTTP API requests. These endpoints already configured with pre-forwarding authentication in #15870, and a handful of others were done already as part of the proof-of-concept work. So this changeset is entirely copy-and-pasting one method call into a whole mess of handlers.
Upcoming PRs will wire up pre-forwarding auth and rate metrics for the remaining set of RPCs that have no API consumers or aren't authenticated, in smaller chunks that can be more thoughtfully reviewed. (And add the metrics reference docs update.)