Dispatcher: remove cluster upgrade job pattern from dispatching when cluster blocked

[jmguzik]

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📥 Commits

Reviewing files that changed from the base of the PR and between 9373ef5 and 8defdf2.

📒 Files selected for processing (2)

• cmd/prow-job-dispatcher/main.go
• cmd/prow-job-dispatcher/main_test.go

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Walkthrough

Introduces cluster relocation blocking exceptions via regex patterns for specific job types. A new function conditionally filters blocked clusters per job, removing the determined target cluster from the blocked set when the job matches an exception pattern. This logic integrates into both delta and volume dispatch paths.

Changes

Cohort / File(s)	Summary
Cluster Relocation Blocking Logic cmd/prow-job-dispatcher/main.go	Added regexp import and blockedClusterRelocationJobExceptions regex patterns to identify exempt jobs (e.g., periodic-build[0-9]{2}-upgrade). Introduced isBlockedClusterRelocationException() to match job names against patterns and blockedClustersForJob() to conditionally filter blocked clusters per job. Updated findClusterAssigmentsForJobs() and clusterVolume.addToVolume() to compute per-job blocked sets instead of using shared blocked set directly.
Test Coverage cmd/prow-job-dispatcher/main_test.go	Added TestBlockedClustersForJob validating the filtered blocked set logic across matching and non-matching jobs. Added TestAddToVolumeSkipsBlockedRelocationForMatchingUpgradePeriodic verifying that matching upgrade jobs remain on blocked clusters while non-matching jobs are relocated.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

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• Create PR with unit tests

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This pull-request has been approved by: jmguzik

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@jmguzik: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/breaking-changes	8defdf2	link	false	/test breaking-changes

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