[metrics] Add last_poll_seconds_ago scanner metric#581
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Purpose
Add
lastPollSecondsAgoconsumer-liveness gauge to fluss-rust, this is the primary signal for detecting stuck consumers, and it must keep advancing between poll events even when no new poll happen.Note:
metrics 0.24facade has no scrape-time gauge supplier abstraction, so the value is pushed by a per-scanner 1-second background tokio task.Linked issue: close #554
Brief change log
Tests
All tests passed.
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