feat: annotate applied manifests with parent placement name

[Copilot]

Applied manifest objects on member clusters had no indication of which placement placed them. The PlacementTrackingLabel (kubernetes-fleet.io/parent-CRP) already exists on Work objects — this change propagates it as an annotation onto each applied manifest object.

Changes

• apply.go: Added placementName string parameter to apply(); after sanitizeManifestObject, sets kubernetes-fleet.io/parent-CRP annotation on manifestObjCopy when the placement name is non-empty
• process.go: Updated the apply() call to pass work.GetLabels()[fleetv1beta1.PlacementTrackingLabel]

Notes

• Reuses the existing PlacementTrackingLabel constant as the annotation key — same semantic, separate map
• The annotation is stripped by discardFieldsIrrelevantInComparisonFrom (all kubernetes-fleet.io/ keys are excluded from comparison), so it does not affect drift detection or manifest hashing

Original prompt

can you please add an annotation on the manifestObjCopy that includes the placement so we can clearly see on the member cluster which placement placed it? The placement label is on the work object so we just need to pass it down the call stack.

The user has attached the following file paths as relevant context:

• .github/copilot-instructions.md
• CLAUDE.md

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[Copilot]

Pull request overview

Propagates placement identity from Work objects down to the applied resources on member clusters by annotating each applied manifest with the parent placement name (kubernetes-fleet.io/parent-CRP), improving traceability without impacting drift detection/hashing.

Changes:

• Pass placement name (from Work label fleetv1beta1.PlacementTrackingLabel) into the apply call path.
• Annotate the sanitized manifest copy with the placement name before applying.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pkg/controllers/workapplier/process.go	Passes the placement tracking label value from the Work into apply() as a new argument.
pkg/controllers/workapplier/apply.go	Adds a placementName parameter to apply() and sets the placement tracking annotation on the manifest being applied.

[Copilot]

New behavior (propagating the Work placement tracking label onto applied objects as an annotation) is introduced here, but there is no unit test covering it. Since this package already has unit tests in apply_test.go, please add a focused test to verify: (1) when placementName is non-empty, the annotation key fleetv1beta1.PlacementTrackingLabel is set on the sanitized manifest copy; and (2) when placementName is empty, no annotation is added/modified. Consider extracting the annotation injection into a small helper to make it easy to unit test without requiring dynamic client interactions.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/controllers/workapplier/apply.go	0.00%	5 Missing and 1 partial ⚠️

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