The existing tests for RecordDeploymentEnd and RecordDeploymentFailure only verified the counter was incremented, not that the histogram was updated with duration observations. Add histogram verification to: - TestCollector_RecordDeploymentEnd_Success - TestCollector_RecordDeploymentEnd_Failure - TestCollector_RecordDeploymentFailure Also add listener tests to verify metrics are properly initialized when MetricsEnabled is true and that the recording functions work correctly in the context of deployment handling. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>