Story (Required)

Add telemetry to expose the number of PipelineRuns and TaskRuns pruned by the Tekton pruner.

Purpose:
Provide visibility into pruning operations for monitoring, alerting, and debugging. This helps verify that the pruner is functioning correctly and cleaning up resources as expected.

Value:

• Enables tracking of pruner activity over time

• Helps detect failures or misconfigurations in the pruning process

• Supports capacity planning and system observability

• Improves trust and transparency in automated cleanup

Expected Metrics (example names):

• tekton_pruner_pipelineruns_pruned_total

• tekton_pruner_taskruns_pruned_total

These metrics should be compatible with Prometheus and visible via standard dashboards and alerting tools.

Background (Required)

https://redhat-internal.slack.com/archives/CG5GV6CJD/p1748446030638729?thread_ts=1748333999.376629&cid=CG5GV6CJD

Out of scope

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Approach (Required)

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Dependencies

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Acceptance Criteria (Mandatory)

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INVEST Checklist

Dependencies identified

Blockers noted and expected delivery timelines set

Design is implementable

Acceptance criteria agreed upon

Story estimated

Legend

Unknown

Verified

Unsatisfied

Done Checklist

• Code is completed, reviewed, documented and checked in
• Unit and integration test automation have been delivered and running cleanly in continuous integration/staging/canary environment
• Continuous Delivery pipeline(s) is able to proceed with new code included
• Customer facing documentation, API docs etc. are produced/updated, reviewed and published
• Acceptance criteria are met