feat: file store merge metrics (#26615)#26834
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* feat(1.x,file_store): port metrics for merge work This commit ports metrics around merging tsm blocks when executing a query. These will appear in EXPLAN ANALYZE results. The new information records the time spent merging blocks, the number of blocks merged, roughly the number of values merged into the first block of each ReadBlock call, and the number of times that single calls to ReadBlock have more than 4 block merges. The multiblock merge is sequential and might benefit from a tree merge algorithm. The latter stat helps identify if the engineering effort would be fruitful. * closes #26614 * chore: switch to a timer for duration printing of times * chore: rename method * fix: avoid race and use new atomic primitive (cherry picked from commit 4e8a3b3)
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This commit ports metrics around merging tsm blocks when executing a query. These will appear in EXPLAN ANALYZE results. The new information records the time spent merging blocks, the number of blocks merged, roughly the number of values merged into the first block of each ReadBlock call, and the number of times that single calls to ReadBlock have more than 4 block merges. The multiblock merge is sequential and might benefit from a tree merge algorithm. The latter stat helps identify if the engineering effort would be fruitful.
closes [1.x] Port merge block stats from cloud2 tsm to 1.x master #26614
chore: switch to a timer for duration printing of times
chore: rename method
fix: avoid race and use new atomic primitive
(cherry picked from commit 4e8a3b3)