mma: cleanup and populate counter metrics

[sumeerbhola]

These metrics use static labels representing origin={external,rebalance}, type={replica,lease}, result={success,failure}.

Epic: CRDB-55052

Release note: None

[cockroach-teamcity]

This change is 

[sumeerbhola]

bors r=wenyihu6

[craig[bot]]

Build succeeded:

• docker_image_amd64
• acceptance
• lint
• local_roachtest
• examples_orms
• linux_amd64_fips_build
• linux_amd64_build
• check_generated_code
• local_roachtest_fips
• unit_tests

[sumeerbhola]

blathers backport 26.1

[blathers-crl[bot]]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

---

:bulb: Consider backporting to the fork repo instead of the main repo. See instructions for more details.

error creating merge commit from baea7bbd0b591e34131334d4722101e6f4340030 to blathers/backport-release-26.1-159123: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 26.1 failed. See errors above.

---

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

[sumeerbhola]

blathers backport 26.1