Gleb Natapov d2b695aa64 session, raft_topology: add periodic warnings for hung drain and stale version waits ...

Add periodic warning timers (every 5 minutes) to help diagnose hangs in
barrier_and_drain:

- drain_closing_sessions(): warn if semaphore acquisition or session gate
  close is taking too long, reporting the gate count to show how many
  guards are still alive.
- local_topology_barrier(): warn if stale_versions_in_use() is taking
  too long, reporting the current stale version trackers.
- session::gate_count(): new public accessor for diagnostic purposes.

These warnings help distinguish between the two possible hang points
in barrier_and_drain (stale versions vs session drain) and provide
ongoing visibility into what's blocking progress.

2026-05-04 15:58:45 +03:00

2.9 KiB

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