Rebuilding the registry view caches resolved each resource's metrics
target by scanning every bySource mapping, an O(resources x mappings)
pass holding the write lock. At about five thousand resources that is
tens of millions of map iterations per rebuild, and rebuilds run on
every poll cycle. The rebuild now inverts the mappings once and the
cached index also serves single-resource lookups while the views are
clean, with the legacy scan kept for dirty-state callers. An
equivalence test pins index results to the legacy scan.
The agent-parent fallback scan also ran its per-entry string
canonicalization before the type check, so every guest in the estate
paid allocation cost in a scan that only ever matches agents. The
cheap checks now run first.
Contract-Neutral: performance-only rework of metrics-target resolution and scan ordering, resolved values are pinned unchanged by equivalence tests
rcourtman
fc50f61cdb