[CELEBORN-XXXX] Expose manually excluded worker count metric - #3772
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[CELEBORN-XXXX] Expose manually excluded worker count metric#3772tashi-rokt wants to merge 1 commit into
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Kalvin2077
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Jul 29, 2026
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What changes were proposed in this pull request?
Add a
ManualExcludedWorkerCountmaster gauge that reports only workers excluded through the manual exclusion mechanism.The existing
ExcludedWorkerCountremains unchanged and continues to report the combined automatic and manual exclusion count. The new gauge is also documented in the master metrics reference.Why are the changes needed?
ExcludedWorkerCountcombines automatic and manual exclusions, so operators cannot determine from metrics whether persistent manual exclusion state is preventing otherwise healthy workers from becoming available.The REST API exposes the two states separately, but diagnosing this condition currently requires querying the active master. Exporting the manual count separately makes the distinction observable through the existing metrics system without changing exclusion behavior.
Does this PR resolve a correctness bug?
Does this PR introduce any user-facing change?
How was this patch tested?
MasterSuitetest that verifies the emitted gauge follows manual exclusion state from 0 to 1 and back to 0../build/mvn -pl master -am -Dtest=none -DwildcardSuites=org.apache.celeborn.service.deploy.master.MasterSuite test./build/mvn spotless:check -Pgoogle-mirror,spark-3.3Both commands passed locally.
Draft note
The CELEBORN Jira is still to be created. Replace
CELEBORN-XXXXin the title and link the Jira before marking this PR ready for review.