TestWatchWithSingleGroupByKeyspace is flaky

[okJiang]

Flaky Test

Which jobs are failing

    resource_manager_test.go:695: 
        	Error Trace:	/home/runner/work/pd/pd/tests/integrations/mcs/resourcemanager/resource_manager_test.go:695
        	Error:      	Received unexpected error:
        	            	get resource group keyspace_test failed, rpc error: code = Unknown desc = [PD:resourcemanager:ErrGroupNotExists]the keyspace_test resource group does not exist
        	Test:       	TestResourceManagerClientTestSuite/standalone-resource-manager-with-client-discovery/TestWatchWithSingleGroupByKeyspace

CI link

• https://prow.tidb.net/view/gs/prow-tidb-logs/pr-logs/pull/tikv_pd/10556/pull-unit-test-next-gen-3/2052713784253878272
• https://github.com/tikv/pd/actions/runs/25589452448/job/75124314436
• https://github.com/tikv/pd/actions/runs/25590441648/job/75127075249
• https://github.com/tikv/pd/actions/runs/25590986834/job/75128509556
• https://github.com/tikv/pd/actions/runs/25591664879/job/75130325890

Reason for failure (if possible)

Anything else

Package: github.com/tikv/pd/tests/integrations/mcs/resourcemanager
Test: TestResourceManagerClientTestSuite/standalone-resource-manager-with-client-discovery/TestWatchWithSingleGroupByKeyspace

[okJiang]

New CI link

• https://github.com/tikv/pd/actions/runs/25718116398/job/75512558237

[okJiang]

• https://github.com/tikv/pd/actions/runs/26034036030/job/76527233804

[okJiang]

New CI links:

• https://github.com/tikv/pd/actions/runs/26147356187/job/76906068032
• https://github.com/tikv/pd/actions/runs/26163846888/job/76962515054

[okJiang]

• https://github.com/tikv/pd/actions/runs/27998374198/job/82865237606
• https://github.com/tikv/pd/actions/runs/27999683430/job/82869171897
• https://github.com/tikv/pd/actions/runs/28006624860/job/82889981540

[okJiang]

New CI links

Observed again for TestResourceManagerClientTestSuite/standalone-resource-manager-with-client-discovery/TestWatchWithSingleGroupByKeyspace:

• https://github.com/tikv/pd/actions/runs/28081415660/job/83137005174 (PR client/resource_group: add RC paging pre-charge with PredictedReadBytes hint #10611)
• https://github.com/tikv/pd/actions/runs/28092212233/job/83172734718 (PR [release-8.5-keyspace] add option to skip rawkv region bound #10535)

[okJiang]

New CI link

Observed again for TestResourceManagerClientTestSuite/standalone-resource-manager-with-client-discovery/TestWatchWithSingleGroupByKeyspace:

• https://github.com/tikv/pd/actions/runs/28211835943/job/83574618351 (PR checker: prefer missing TiFlash learner before offline peer #10928)

[okJiang]

New CI link(s):

• https://github.com/tikv/pd/actions/runs/28408149711/job/84175141123
• https://github.com/tikv/pd/actions/runs/28431345321/job/84246549569
• https://github.com/tikv/pd/actions/runs/28432879695/job/84251602478

[okJiang]

New CI link(s):

• https://github.com/tikv/pd/actions/runs/28489896884/job/84444132975
• https://github.com/tikv/pd/actions/runs/28493084114/job/84453656734