wqliang opened a new issue #1689: StatsItem not remove after group or topic be removed URL: https://github.com/apache/rocketmq/issues/1689 **BUG REPORT** 1. Please describe the issue you observed: BrokerStatsThread at broker side will make some statistic on group level and topic level. After a subscription group or topic be removed, the corresponding stats item not be removed untill broker restart. I need to create new group frequently and each group will be removed after finish it's sonsumption task. The StatsItem of nonexistent group would never be removed which may cause oom. I have already add such interface and remove StatsItem when group or topic be removed. Maybe create and remove a group frequently is not a good idea, but can BrokerStatsManager provide a interface to remove unused statsItem?
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