evelyn.zhaojie

3.1 backport https://github.com/StarRocks/starrocks/pull/41899

@kangkaisen pls review the code

@mergify backport branch-3.3

@mergify backport branch-2.5

this may be a related PR and description: https://github.com/StarRocks/starrocks/pull/31750 mechanism for removing a BE from the blacklist