Move the victim cache statistics out of the block cache group

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    • Type: Task
    • Resolution: Unresolved
    • Priority: Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Block Cache, Statistics
    • None
    • Storage Engines - Persistence
    • 87.51
    • StorEng - Defined Pipeline
    • None

      Seven stats describe the disaggregated victim cache but live under BlockCacheStat with a block_cache_ prefix: block_cache_puts, _app_thread_puts, _put_time, _app_thread_put_time, _put_time_max, _cold_not_cached, _put_failures. They were never block cache stats, all seven were added as victim cache stats (WT-17850, WT-17854, WT-17815, WT-18696) and their descriptions already say "disaggregated victim cache".

      Move them to DisaggStat as disagg_victim_cache_* and drop the now-redundant "disaggregated" from the descriptions.

      This moves them in serverStatus().wiredTiger from block-cache to disagg, since MongoDB keys that output by the stat description. Nothing consumes them today, checked mongo outside third_party (including the curated allowlist in WiredTigerKVEngine::collectStorageStats) and t2, whose 22 block-cache descriptors are all genuine block cache stats. 

            Assignee:
            Mariam Mojid
            Reporter:
            Mariam Mojid
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              Created:
              Updated: