enhance: Tidy dc channel manager

[XuanYang-cn]

See also: #34518

[mergify]

@XuanYang-cn Please associate the related issue to the body of your Pull Request. (eg. “issue: #”)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.91%. Comparing base (eeb03a0) to head (aeefb4e).
Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #34515       +/-   ##
===========================================
- Coverage   79.76%   57.91%   -21.85%     
===========================================
  Files        1127      269      -858     
  Lines      139415    24168   -115247     
===========================================
- Hits       111203    13997    -97206     
+ Misses      23919    10171    -13748     
+ Partials     4293        0     -4293     

see 859 files with indirect coverage changes

[congqixia]

/lgtm

[sre-ci-robot]

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