[Enhancement] Make autoDeleteUnusedStats config default to true

[RongtongJin]

Before Creating the Enhancement Request

• I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Summary

When the broker runs for an extended period and topics and subscriptions are frequently created and deleted, we notice a significant amount of stats information lingering in memory. This leads to high memory usage and even full garbage collection (FGC). I believe it is necessary to set autoDeleteUnusedStats to true by default, to promptly clean up these unused stats information

Motivation

When the broker runs for an extended period and topics and subscriptions are frequently created and deleted, we notice a significant amount of stats information lingering in memory. This leads to high memory usage and even full garbage collection (FGC). I believe it is necessary to set autoDeleteUnusedStats to true by default, to promptly clean up these unused stats information.

Describe the Solution You'd Like

Make autoDeleteUnusedStats config default to true

Describe Alternatives You've Considered

No

Additional Context

No