Guard VPD skip reporting behind discovery flag

[almaslennikov]

Summary

• keep VPD discovery failures out of SkippedDevices() unless SKIP_DEVICE_ON_DISCOVERY_ERROR=true
• preserve existing enabled behavior where VPD failures are reported as skipped devices when the flag is set
• add regression coverage for both default and enabled VPD failure behavior

Testing

• go test ./pkg/devicediscovery/... -v
• go build ./...
• git diff --check

Note: this follows up on the release backport review finding so main and the backport keep the same opt-in semantics.

[greptile-apps]

Greptile Summary

This PR updates VPD discovery failure handling for skipped-device reporting. The main changes are:

• Adds a separate incomplete-device report for discovery failures that should preserve existing CRs.
• Keeps VPD failures out of SkippedDevices() unless SKIP_DEVICE_ON_DISCOVERY_ERROR=true.
• Updates reconciliation to preserve CRs for both skipped and incomplete devices.
• Adds tests for default and enabled VPD failure behavior.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
pkg/devicediscovery/devicediscovery.go	Adds incomplete-device tracking and keeps default VPD failures separate from skipped-device reporting.
internal/controller/devicediscovery_controller.go	Uses incomplete and skipped device reports to preserve existing CRs when discovery omits a physical device.
pkg/devicediscovery/devicediscovery_test.go	Adds tests for VPD failures with default and enabled skipped-device reporting.
internal/controller/devicediscovery_controller_test.go	Adds controller coverage for preserving CRs when discovery reports an incomplete device.

_{Reviews (3): Last reviewed commit: "Guard VPD skip reporting behind discover..." | Re-trigger Greptile}

[greptile-apps]

Partial Device Survives VPD Failure

When one port of a multi-port NIC has already populated statuses[pciKey] and a later port fails GetVPD, this branch no longer removes the partially built physical device unless reporting is enabled. Discovery can return a NicDevice with only the earlier ports, so the controller reconciles a truncated device instead of treating the physical NIC as incompletely discovered.

[greptile-apps]

Skipped Device Becomes Deletable

For a single-port NIC with an existing NicDevice CR, a GetVPD failure now returns no observed device and leaves SkippedDevices() empty when the flag is unset. The controller path that preserves skipped devices will not run, so the next reconcile can delete the CR for a physically present device that was only omitted because VPD discovery failed.

[almaslennikov]

Addressed Greptile's VPD cleanup finding and force-pushed amended commit b6154fd:

1. Partial Device Survives VPD Failure: split partial-status cleanup from skip reporting. A VPD failure now always removes any partially assembled physical device from statuses, so discovery cannot return a truncated multi-port NicDevice.
2. Skipped Device Becomes Deletable: kept CR preservation opt-in. SkippedDevices() is still populated for VPD failures only when SKIP_DEVICE_ON_DISCOVERY_ERROR=true, matching the flag semantics while preserving the cleanup behavior above.

Validation: go test ./pkg/devicediscovery/... -v, go build ./..., and git diff --check are clean locally.

[greptile-apps]

CR deletion remains

When GetVPD fails with SKIP_DEVICE_ON_DISCOVERY_ERROR unset, this branch removes the device from statuses but leaves skippedDevices empty. The controller then receives no observed device and no skipped marker for the PCI key, so an existing NicDevice CR for a physically present NIC can be treated as removed hardware and deleted. This is reachable for a single-port NIC whose VPD read fails, and for a multi-port NIC when a later port fails after an earlier port populated statuses. The discovery result can stay hidden from SkippedDevices() for reporting, but reconciliation still needs a preservation signal for devices omitted because discovery was incomplete.

[almaslennikov]

Addressed the new Greptile P1 and force-pushed amended commit 455acc6:

1. CR deletion remains: split discovery omission reporting from reconciliation preservation. SkippedDevices() stays controlled by SKIP_DEVICE_ON_DISCOVERY_ERROR, while the new IncompleteDevices() signal tells the controller to preserve existing CRs for devices omitted because discovery could not build complete status.
2. Partial/truncated devices: VPD failures now always mark the physical PCI key incomplete and drop any partially assembled status, so multi-port NICs cannot be reconciled with only the successfully discovered ports.
3. Controller behavior: the device discovery controller now preserves CRs for IncompleteDevices() and still supports the previous SkippedDevices() signal for compatibility.

Validation: go test ./pkg/devicediscovery/... -v, go test -c ./internal/controller -o /tmp/nco-controller-tests-main-followup.test, go build ./..., and git diff --check are clean locally.