The CP_HICACHE_LANE_STATS occ/used_tokens are derived from _cp_counts, which the
accounting explicitly skips for shared-L2 metadata (_cp_account_*: `not
_is_cp_shared_l2_metadata`), so they read 0 with l2 pooling on regardless of
actual fill -- wrong gauge for the shared pool. Add cache_controller
.cp_shared_l2_cache_report() (pages_used / pages_capacity / objects_committed /
objects_aborted / objects_evicted + load_hits/misses from the replicated
CpSharedL2PageAllocator stats) to the lane-stats line as `shared_l2_pool=...`
when the allocator is constructed, so fill->evict->load-back is observable.
Read-only; rank-0 only; takes effect on next restart.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
leavelet
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