server: add logging for the decommission nudger #148090
Description
The recently-added decommission nudger (#130117) is responsible for periodically enqueuing ranges with replicas which should be decommissioned to the replicate queue.
We need a way to tell if it's working as expected. Either some logging or a metric would help.
Jira issue: CRDB-51396
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Relating to rebalancing and leasing.Solution expected to add code/behavior + preserve backward-compat (pg compat issues are exception)Likely to be a quick win for someone experienced.Might be suitable for a starter project for new employees or team members.Would prevent or help troubleshoot a customer escalation - bugs, missing observability/tooling, docsIssues/test failures with no fix SLAKV Team