[MCS] scheduler show does not display handler-only schedulers (evict-leader-scheduler, etc.)

[King-Dylan]

Bug Report

After PR #7082 (introduced schedulerHandlers) In MCS mode, handler-only schedulers (e.g., evict-leader-scheduler) in API Service are stored in the schedulerHandlers map GetSchedulerNames() only iterates the schedulers map and does not include the schedulerHandlers map. This causes scheduler show to fail to display these schedulers

What did you do?

In MCS (Microservice) mode, after adding a scheduler via pd-ctl scheduler add evict-leader-scheduler <store-id>, executing scheduler show does not display the scheduler.

What did you expect to see?

scheduler show should display all added schedulers, including handler-only schedulers (e.g., evict-leader-scheduler).

What did you see instead?

scheduler show does not display handler-only schedulers, even though the scheduler has been successfully added and is working correctly.

What version of PD are you using (pd-server -V)?

v8.5.4

[lhy1024]

maybe need some specail cases.