fix(healthcheck): a stalled parked claim is not removal coverage (EXSC-867)

[0xDEnYO]

Which Linear task belongs to this PR?

Fixes EXSC-867

Why did I implement it this way?

no-stale-registered-facets treated the mere existence of an open parked task as coverage for a deprecated-but-routed facet. It could not distinguish "cleanup in flight" from "cleanup silently dead", so a stalled task kept the check green indefinitely while the facet stayed routed in production.

Found live during a fleet sweep of the parked queue: mantle GenericSwapFacet v2.0.0 at 0x2b7D2C78bd801Cc06DDCF91DeE2e8fAE22814f7e (origin #2046) sat status: proposed with no safeTxHash — no Safe transaction was ever created for anyone to sign — for 29 days, still routing 4 selectors, while the check reported green the whole time.

Root cause. The drain flips queued → proposed (claimForProposal) before the Safe proposal exists and stamps safeTxHash afterwards (linkToProposal). A drain that dies between the two leaves a record no unattended job can move:

Path	Behaviour on such a record
drain-parked-tasks.ts	claims status: 'queued' only → never re-claims it
reconcileDecision()	returns 'keep' (facet on-chain, no linked proposal status)
repair-orphaned-parked-tasks.ts	counts it unlinked, logs "leaving for manual review", skips
cancel-parked-task.ts	refuses — markCancelled is queued-only

So coverage had to become liveness, not existence:

• queued → always live. The next drain claims it; age alone is backlog, not breakage. Flagging old queued tasks would red every chain with a slow rollout (there are 16 such tasks right now from chore(SymbiosisFacet): prod deploy + cut of v2.0.0 to 37 chains (EXSC-267) #2108).
• proposed with safeTxHash → live. A real proposal exists and reconcile resolves it once that proposal executes or reverts.
• proposed without safeTxHash past STALE_PARKED_CLAIM_DAYS → stalled. 7 days is deliberately generous: proposals are signed and executed within ~48h in practice, so a week without one is unambiguous breakage rather than slowness. The bound is not zero because a healthy drain legitimately holds that state for the seconds between claiming and linking.

severity also went warning → error, and both the stalled and the uncovered class now report via ctx.logError instead of ctx.logWarn. failed = errors.length > 0 in executeInvariant, so previously nothing gated on this check; severity: 'error' additionally buys the transient-RPC re-verify pass. The live class stays an info line.

The remediation string is now split per class, because the two need opposite actions — a stalled claim must not be re-enqueued (the open task blocks the dedup gate) and must not be cancelled (that abandons a live deprecation); it needs revertToQueued, whose missing operator CLI is EXSC-715.

Both halves of the hole

no-stale-registered-facets and no-unexpected-facets are the two halves of detection for this failure, as docs/DeferredDiamondCleanupQueue.md states: the first sees a deprecated facet while the deploy log still names it, the second sees it once the deprecation PR prunes that entry (pruning is explicitly licensed by an open queued/proposed task).

Gating only the first on liveness would have left the pruned half still downgrading a dead claim to an info line — hiding the same defect in the place the other invariant structurally cannot look, since it resolves names through the deploy log. So no-unexpected-facets now declines the expected-pending downgrade for a stalled claim and warns instead.

That branch cannot fire on today's fleet: the one stalled claim (mantle) is still deploy-logged, so its address never reaches the unlogged set. It is also warning-severity, so it cannot red a run.

Deliberately NOT changed: skipTestnet

skipTestnet: true was the suspected reason deprecated facets survived on four testnets. It is not the cause, so flipping it would have been a cosmetic fix hiding a real gap. No testnet has a production target-state entry in _targetState.json — the entries exist but are empty objects — so getExpectedFacetNames() returns undefined and the invariant early-returns whatever the flag says. Verified by running the real findDeprecatedLiveFacets over the 5 active non-mainnet networks: 3 skipped for "no target-state entry", 0 findings. The comment now records this so nobody "fixes" the flag expecting a behaviour change, and the actual gap is EXSC-868.

Falsification on real data

Same-PR tests are not evidence a new check can fire, so the shipped splitByParkedCoverage was run against live facets() reads and the live queue across all 66 active mainnet networks (zero unreadable):

networks evaluated: 66  (STALE_PARKED_CLAIM_DAYS=7)
mantle  deprecated=1 parked=0 UNPARKED=0 STALLED=1
    stalled: GenericSwapFacet@0x2b7D2C78bd801Cc06DDCF91DeE2e8fAE22814f7e status=proposed safeTxHash=ABSENT
TOTALS: would-error-on-unparked=0, would-error-on-stalled=1

• fires on exactly the one known real defect, and on nothing else
• unparked = 0 fleet-wide, so the logError flip reds no network that is healthy today — this change does not turn on a fleet-wide red

Negative controls are unit-tested: queued at 400 days, proposed with a safeTxHash at 90 days, a claim one day inside the bound, and an unreachable queue all stay green.

Note: mantle's queue row is being repaired in parallel, so once that lands the fleet goes green on this check. The snapshot above is from 2026-08-28T09:14Z.

Checklist before requesting a review

• I have performed a self-review of my code
• This pull request is as small as possible and only tackles one problem
• I have added tests that cover the functionality / test the bug
• For new facets: I have checked all points from this list: https://www.notion.so/lifi/New-Facet-Contract-Checklist-157f0ff14ac78095a2b8f999d655622e
• I have updated any required documentation

Checklist for reviewer (DO NOT DEPLOY and contracts BEFORE CHECKING THIS!!!)

• I have checked that any arbitrary calls to external contracts are validated and or restricted
• I have checked that any privileged calls (i.e. storage modifications) are validated and or restricted
• I have ensured that any new contracts have had AT A MINIMUM 1 preliminary audit conducted on by <company/auditor>

[coderabbitai]

Walkthrough

The health checks now use full parked-task records to identify stale proposed claims. Live claims remain coverage, while stalled claims and unparked facets produce production errors. Tests and design documentation cover the new classification and remediation behavior.

Changes

Parked claim liveness

Layer / File(s)	Summary
Coverage records and liveness partitioning script/deploy/healthCheckInvariants.ts, script/deploy/healthCheckInvariants.test.ts	Open parked-removal entries now include task status, timestamps, and safeTxHash. isStalledParkedClaim and splitByParkedCoverage classify live, stalled, and unparked facets.
Invariant enforcement and validation script/deploy/healthCheckInvariants.ts, script/deploy/healthCheckInvariants.test.ts, docs/DeferredDiamondCleanupQueue.md	no-stale-registered-facets now reports stalled and unparked facets as production errors. no-unexpected-facets no longer treats stalled claims as pending coverage. Tests and the design document describe the updated behavior.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟡 Moderate · up to 8064a

The health check now treats stalled parked claims as failed coverage, but duplicate open tasks can still cause an unresolved stalled removal to appear live, while claims for deploy-log-pruned facets remain warning-only. These cases can leave deprecated functionality routed without a failing production gate, so the PR needs owner follow-up before merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description includes the required Linear task, implementation rationale, review checklists, testing details, documentation changes, scope decisions, and validation results. The unchecked new-facet…
Title check	✅ Passed	The title clearly and concisely identifies the main change: stalled parked claims no longer count as removal coverage in the health check.

Full details: Docstring Coverage

Explanation

Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files. (1 skipped: 1 unsupported.)

Full details: Description check

Explanation

The description includes the required Linear task, implementation rationale, review checklists, testing details, documentation changes, scope decisions, and validation results. The unchecked new-facet and contract-audit items are not applicable to this non-contract change.

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[0xDEnYO]

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Actionable comments posted: 2

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Inline comments:
In `@docs/DeferredDiamondCleanupQueue.md`:
- Around line 626-632: Correct the stale recovery guidance in
DeferredDiamondCleanupQueue by removing the implication that an operator CLI can
currently clear an unlinked parked claim. Document the available manual recovery
procedure, or explicitly mark the operator CLI as pending until EXSC-715
implements revertToQueued, keeping the related no-stale-registered-facets
remediation consistent.

In `@script/deploy/healthCheckInvariants.ts`:
- Around line 1383-1394: The fetchOpenParkedAddressesByNetwork aggregation must
preserve duplicate open tasks for the same lowercased facet address instead of
overwriting earlier entries in the byNetwork map. Update the per-network
structure and downstream handling so an address-keyed proposed task followed by
a legacy name-keyed queued task is retained and classified as stalled or
otherwise remains detectable by the drain.

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• script/deploy/healthCheckInvariants.ts

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[0xDEnYO]

Both findings were valid and are fixed in 8b162cd.

Duplicate open tasks per address (Major). Confirmed reachable, and the precondition is live today: computeTaskKey is address-keyed, but the open-status unique index is on taskKey, so a legacy name-keyed row does not collide with it. The live queue has exactly one such legacy open row — mantle GenericSwapFacet — and it is the stalled one. A plain overwrite therefore let queue sort order decide whether the stalled claim survived. The collapse now lives in an extracted, unit-tested collapseOpenParkedTasks() and is stall-dominant, so it is order-independent.

Falsified against the live queue rather than only in tests — real 22-task queue plus mantle's real legacy row paired with a synthetic address-keyed sibling:

live open tasks: 22
collapsed entries: 22 (no dupes today)   # no behaviour change for current data
mantle row survives collapse: status=proposed safeTxHash=ABSENT stalled=true
  stalled first:  kept status=proposed -> classified STALLED (fails)
  stalled second: kept status=proposed -> classified STALLED (fails)

Remediation text (Minor). Sharper than reported: the string did not just imply a CLI exists, it asserted "the open task blocks the dedup gate", which is false for a legacy name-keyed row — re-enqueueing mantle's address would not collide and would open a second open task. Both the remediation and the doc now state that clearing a stalled claim has no shipped operator path (EXSC-715), that re-enqueueing is not a workaround and why, and that it belongs with the SC on-call until the CLI lands.

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