Tomasz Grabiec dd0fc35c63 lsa: Export metrics for reclaim/evict/compact time ...

Currently, we only know about long reclaims from lsa-timing stall
reports. Shorter reclaims can go under the radar.

Those metrics will help to asses increase in LSA activity, which
translates to higher CPU cost of a workload.

reclaim tracks memory which goes to the standard allocator, e.g. when
entering and allocating_section or in the background reclaimer.

evict/compact count activity towrads building LSA reserve, in
allocating_section entry, or naked LSA allocation.

Closes scylladb/scylladb#27774

2026-01-19 12:08:16 +03:00

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