[ECOINT-304] Add CockroachDB storage and KV metrics

[rmloveland]

What does this PR do?

Adds the following CockroachDB metrics (related to Storage and KV layers) using their DataDog names:

• storage_wal_fsync_latency
• rebalancing_replicas_queriespersecond
• range_merges
• rebalancing_lease_transfers
• rebalancing_range_rebalances

See also cockroachdb/docs#19425, where these were added to the CockroachDB docs.

Motivation

Integration of these important KV & storage metrics with DataDog

Review checklist

• PR has a meaningful title or PR has the no-changelog label attached
• Feature or bugfix has tests
• Git history is clean
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• If this PR includes a log pipeline, please add a description describing the remappers and processors.

[rmloveland]

Hi @estherk15! i noticed you reviewed this previous Cockroach Cloud metrics PR a while ago:

#2322

Are you the right person to ask for a review on this one? Or do you know who I should ask?

Thanks!

[rmloveland]

hi @dd-dominic I noticed you reviewed #2812 - any chance you could take a peek at this one?

[dd-dominic]

@rmloveland thanks for opening a PR. Please update the changelog with an entry for 2.1.0.

The current changelog also needs to be reformatted. Dates should be added to each entry and the order needs to be in descending order - the latest entry (2.1.0) should be first. See this format: https://docs.datadoghq.com/developers/integrations/agent_integration/?tab=buildanoutoftheboxintegration#bumping-an-integration-version

[rmloveland]

Please update the changelog with an entry for 2.1.0.

The current changelog also needs to be reformatted. Dates should be added to each entry and the order needs to be in descending order - the latest entry (2.1.0) should be first. See this format: https://docs.datadoghq.com/developers/integrations/agent_integration/?tab=buildanoutoftheboxintegration#bumping-an-integration-version

Thanks @dd-dominic ! Updated the changelog and reformatted to use descending order, with dates. Please take a look! Happy to update further as needed

[dd-dominic]

We recently added a sample_tags column. If the integration is providing tags by default , please add them in this column. See https://docs.datadoghq.com/developers/integrations/check_references/#metrics-metadata-file.

[rmloveland]

@dd-dominic I don't know offhand if the integration is providing these tags. Since it's listed as an optional attribute in the documentation, could we add that info in a followup PR? I'd love to get these storage metrics documented and then do more of the metadata/housekeeping stuff separately if that's possible. Please let me know what you think!

[github-actions]

This pull request has not been updated for more than 21 days. If there are no updates to this PR within 7 days, it will be closed. If you'd like to re-open this PR after it's been closed, you can start from the latest master branch or pull the latest changes into your branch and create a new pull request.