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google_logging_metric.relay_snapshot only creates metrics for fields listed in relay_runtime_metrics, and the cellInventoryHold* fields were never added when the hold telemetry landed. They have been log-only since, so nothing could alert on the lock and the contention stayed invisible in exactly the way the telemetry was meant to prevent. Maps the three hold fields and both new failure counters. Also corrects the field comment: the split is by wait policy, not by caller. assignOnce takes the inventory fail-fast on its first placement attempt, so request-reachable sites land in cellInventoryLockUnavailable too; that lane reads as contention pressure, and the expired bounded wait is the stall lane.