server: export distsender metrics from SQL pods

[nvanbenschoten]

This commit exports the DistSender timeseries metrics from SQL pods.

distsender.batches
distsender.batches.partial
distsender.batch_requests.replica_addressed.bytes
distsender.batch_responses.replica_addressed.bytes
distsender.batch_requests.cross_region.bytes
distsender.batch_responses.cross_region.bytes
distsender.batch_requests.cross_zone.bytes
distsender.batch_responses.cross_zone.bytes
distsender.batches.async.sent
distsender.batches.async.throttled
distsender.rpc.sent
distsender.rpc.sent.local
distsender.rpc.sent.nextreplicaerror
distsender.errors.notleaseholder
distsender.errors.inleasetransferbackoffs
distsender.rangelookups
requests.slow.distsender
distsender.rpc.%s.sent # rpc name
distsender.rpc.err.%s  # error name
distsender.rangefeed.total_ranges
distsender.rangefeed.catchup_ranges
distsender.rangefeed.error_catchup_ranges
distsender.rangefeed.restart_ranges
distsender.rangefeed.restart_stuck

Epic: None
Release note: None

[blathers-crl]

It looks like your PR touches production code but doesn't add or edit any test code. Did you consider adding tests to your PR?

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[cockroach-teamcity]

This change is 

[knz]

Thank you

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @nvanbenschoten)

[nvanbenschoten]

bors r=knz

[craig]

This PR was included in a batch that timed out, it will be automatically retried

[craig]

This PR was included in a batch that timed out, it will be automatically retried

[craig]

Timed out.

[nvanbenschoten]

bors r=knz

[craig]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)