[v24.3.x] datalake/metrics: miscellaneous improvements to lag metrics #24575
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This is based on our experience debugging Brandon's perf setup. - Changes the metric reporting to report lag only on leaders. This makes it easy to monitor the metric using an aggregate across all replicas without having to worry about the current leader. - Fixed a bug where lag entry was not added to serde fields, adjusted the test coverage to catch this scenario, refactored the test slightly while I'm there. (cherry picked from commit bef3254)
bharathv
approved these changes
Dec 15, 2024
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Backport of PR #24568