kitzhang

Results 3 issues of kitzhang

See https://github.com/pingcap/dumpling/issues/282

needs-cherry-pick-release-5.0
size/S
needs-cherry-pick-release-4.0
needs-cherry-pick-release-5.1
needs-cherry-pick-release-5.2

File: [/zh/handle-alerts.md](https://docs.pingcap.com/zh/tidb-data-migration/stable/handle-alerts) ``` DM_dump_process_exists_with_error DM_load_process_exists_with_error DM_sync_process_exists_with_error ``` 这三个错误名字,exists应该更正为exits,prometheus的dm_worker.rules.yml中名字也需要改

### What did you do? execute statement `TRUNCATE TABLE test.t1;` on upstream mysql ### What did you expect to see? DM sync `TRUNCATE TABLE` statement to downstream as expect ###...

subject/new-feature
area/dm