f1amingo commented on PR #10645:
URL: https://github.com/apache/rocketmq/pull/10645#issuecomment-5040975236

   Thanks for the thoughtful review!
   
   1. **Conditional registration**: Adopted. The gauge is now gated behind 
`messageStore.getMessageStoreConfig().isEnableLmq()`, so clusters without LMQ 
enabled won't emit this series at all. Updated in the latest push.
   
   2. **O(1) confirmed**: `getLmqNum()` simply returns `lmqCounter.get()` — an 
`AtomicInteger` maintained incrementally on LMQ creation/deletion. No table 
scan involved, safe for high-frequency collection.


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