feat(orchestrator): capture runner Pod post-mortem before cleanup - #306
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📝 WalkthroughWalkthroughThe change captures terminated workflow runner Pod evidence before cleanup, stores it once per attempt, and adds validated cause-of-death details to failure notices and logs. It also adds Kubernetes RBAC, reserved-state protection, observability documentation, and comprehensive tests. ChangesWorkflow runner Pod post-mortem
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The new test can fail type checking, and some stalled runners can lose their only post-mortem diagnostics or repeatedly fail Pod inspection without an operational trace. Resolve these before merge. Sequence Diagram(s)sequenceDiagram
participant workflowRunnerReconciler
participant Kubernetes
participant workflowRunnerStore
participant workflowExpiryNotifier
workflowRunnerReconciler->>Kubernetes: Read terminated runner Pod and log tail
Kubernetes-->>workflowRunnerReconciler: Return post-mortem evidence
workflowRunnerReconciler->>workflowRunnerStore: Store _runnerPostMortem once per attempt
workflowExpiryNotifier->>workflowRunnerStore: Read stored post-mortem
workflowExpiryNotifier-->>workflowExpiryNotifier: Add validated reason and exit code to notice
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 61.90% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 10 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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When a runner Pod dies mid-attempt the failure comment says only that the runner stopped renewing its lease, which cannot separate an OOMKill from a crash from a node eviction. By the time anyone asks, cleanup has deleted the Pod, its terminated container status and its log, and the cluster log pipeline is not a dependable second copy: a dead runner on this deployment showed 547 lines in the Datadog aggregate API and zero retrievable events in search. The reconciler now reads the Pod once, on the first pass that sees it stalled, and persists the kubelet reason, exit code, signal, Pod-level verdict and a secret-stripped 200-line log tail to `workflow_runs.state._runnerPostMortem`. The write is fenced on the key being absent and on `attempt_id`, so the first reading survives the 30s loop and a superseded attempt cannot stamp the current one, and an all-null reading is discarded rather than spending the one-shot slot. Capture runs regardless of what the terminalization branches do, because that pass is the only moment the controller holds both the evidence and a live Pod. The public failure comment gains one line carrying only the kubelet reason and exit code, both shape-checked. The termination message and log tail are repository content and stay in the controller log. `_runnerPostMortem` joins the controller-reserved state keys so a runner cannot pre-set it and suppress its own post-mortem, and the WebSocket close line now carries the run and attempt ids so an abnormal 1006 close ties to the run it ended. Needs `pods/log` `get` on the runner namespace Role. Without it the capture degrades to the terminated container status and records why. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TGnjV4sgzrDCVNznUQ1uuv
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…notices Six review findings on the Pod post-mortem. The log tail was sliced at a fixed UTF-16 index, so a cut inside an astral character left a lone surrogate. `JSON.stringify` renders that as a `\udXXX` escape and Postgres rejects it on the `jsonb` cast, verified against Postgres 17 with the store's own `state || $1::jsonb` statement. `capturePodPostMortem` swallows the throw as a warning and writes nothing, so the one-shot fence never closes and every later pass re-reads the Pod and fails identically. The post-mortem was lost for exactly the runs with the most log to show. Unpaired surrogates are now replaced with U+FFFD. `podPostMortemLine` was wired into the lease-expiry notice only, but the reconciler captures for every stalled attempt and a pre-payload one is terminalized by `notifyRunnerStartFailures`. A Pod OOMKilled before registering therefore said "could not start: PodFailed" while the run row held `OOMKilled` and exit 137. That notice now quotes the same bounded fields. Reaching the 256 KB transfer ceiling means the server stopped sending before the runner's final lines, since the 200-line window starts at the oldest of them, so the tail is from the middle of the run. That is now reported in `logError` rather than left to look like the end of the log. The `lastState` fallback read the live container's log next to a replaced container's exit code. The log read now follows the verdict via `previous`. Two JSDoc blocks documenting `capturePodPostMortem` and `recordWorkflowRunnerPostMortem` sat above the wrong function, so the two contracts that matter to callers, "never throws" and the one-shot fence, were invisible on hover. Moved onto the functions they describe. I did not take the line-alignment half of the surrogate suggestion. Advancing the cut to the next newline reads better, but a window holding one long line and one short one would then store the short one and discard 16 KB of context. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TGnjV4sgzrDCVNznUQ1uuv
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Actionable comments posted: 4
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Inline comments:
In `@src/k8s/workflow-runner-postmortem.ts`:
- Around line 182-186: Update the readNamespacedPod error handler in
capturePodPostMortem to emit a debug log containing the failure details and
relevant pod context before returning null; preserve the existing early-return
behavior.
In `@src/orchestrator/workflow-expiry-notifier.ts`:
- Line 225: Rename the KUBELET_REASON constant to kubeletReason and update its
reference in podPostMortemLine, preserving the existing regular expression and
behavior.
In `@src/orchestrator/workflow-runner-reconciler.ts`:
- Around line 36-39: Update the isInformative predicate in the post-mortem
persistence flow to treat every non-empty evidence field as informative,
including logError, podMessage, message, signal, startedAt, and finishedAt, so
line 61 persists diagnostics when any of these fields is present.
In `@test/orchestrator/workflow-expiry-notifier.test.ts`:
- Line 331: Update the assignment to the state field on failed to use bracket
access instead of property access, preserving the existing value and behavior.
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📒 Files selected for processing (12)
docs/operate/deployment.mddocs/operate/observability.mdsrc/k8s/workflow-runner-postmortem.tssrc/orchestrator/workflow-expiry-notifier.tssrc/orchestrator/workflow-runner-reconciler.tssrc/orchestrator/workflow-runner-store.tssrc/orchestrator/ws-server.tssrc/shared/workflow-runner-messages.tstest/k8s/workflow-runner-postmortem.test.tstest/orchestrator/workflow-expiry-notifier.test.tstest/orchestrator/workflow-runner-reconciler.test.tstest/orchestrator/workflow-runner-store.test.ts
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bot workflow 🔍 Code review complete, 12 files, +1032/-10. SummaryReviewed all 12 changed files at head What was checkedFiles read in full: Cross-references performed:
Validation runs: Findings[minor] [minor] [minor] ReasoningNon-trivial "no issue here" calls I made deliberately:
cost: $5.8015 · turns: 63 · duration: 510s 🧠 Learnings used (1) |
Round two review findings on the Pod post-mortem. A runner whose process returns 0 without ever sending a result was the one silent death this feature could not explain. `classifyPodStartup` maps phase `Succeeded` to `running`, so such an attempt stayed classified running on every pass, captured nothing, and had its Pod and log deleted at lease-expiry cleanup. `RunnerPodStartup`'s running variant now carries `terminal`, and the reconciler treats a terminal Pod as dead. Reaching a still-active attempt means no result was reported, so there is no healthy run to misreport. The 16 KB tail cap counted UTF-16 code units while the constant, the comment, the observability table and the ceiling check 34 lines below all meant bytes. Emoji-heavy agent output would have stored about four times the budget. The cut is now taken in UTF-8 and advanced past any continuation bytes, which also makes the result well-formed by construction and retires the surrogate scrub the previous commit added: skipping the partial character keeps the budget exact, where decoding it would expand each stray byte into a three-byte U+FFFD. A refused or failed Pod-status read returned null with nothing logged, so it repeated on every pass without evidence. Now logged at debug. `_runnerPostMortem` was added to `CONTROLLER_RESERVED_STATE_KEYS` without extending the test that iterates them, leaving the security argument for the key unenforced against a refactor. I did not widen `isInformative` to accept a `logError`-only reading. The suggestion would defeat the fence it feeds: a permanent `pods/log` 403 on a pass that catches the Pod before kubelet wrote any status would then win the one-shot slot and lock out the later pass holding the real verdict. The other proposed fields are unreachable without `exitCode`, which is required on a terminated container state. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TGnjV4sgzrDCVNznUQ1uuv
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Stack 2 of 3. Base
feat/runner-resource-config(#305). Review only the second commit; merge #305 first.Problem
When a runner Pod dies mid-attempt, the failure comment says the runner stopped renewing its lease. That cannot separate an OOMKill from a crash from a node eviction, and by the time anyone reads it there is nothing left to inspect: cleanup deletes the Pod, its terminated container status and its container log within seconds of the run being terminalized.
The cluster log pipeline is not a dependable second copy. On this deployment a dead runner showed 547 lines in the Datadog Logs aggregate API and zero retrievable events in search, with no container metrics collected at all.
Change
src/k8s/workflow-runner-postmortem.ts(new) reads the Pod and its log tail. The reconciler calls it on the first pass that sees an attemptstalled, and persists the result toworkflow_runs.state._runnerPostMortem:reason,exitCode,signal,messageOOMKilled+137is the memory limit.podReason,podMessageEvictedfor node pressure such as a filled ephemeral-storage limit, which never appears in the container's terminated state.logTaillogErrorlogTailis empty. A403means the Role is missingpods/log.Capture runs regardless of what the terminalization branches below it do, because that pass is the only moment the controller holds both the evidence and a live Pod: the lease still has minutes and nothing has been deleted.
Correctness fences
_runnerPostMortembeing absent, so the 30s loop stores the first reading rather than overwriting it with a progressively emptier one as Kubernetes garbage-collects the Pod, and onattempt_id, so a superseded attempt cannot stamp the current one. Only the write that lands returnstrue, which is also the cue to log exactly once.hasWorkflowRunnerPostMortemis consulted before the two Kubernetes reads. A stalled attempt whose payload was already issued stays stalled until its lease expires, so without it every pass would re-read the Pod and up to 16 KB of log only for the fenced write to discard it.Security
logTailis repository content and may carry a token the agent printed, so it goes throughredactSecretsbefore it reaches the controller log or the run row (security invariant build(deps): bump the production-dependencies group with 4 updates #2). It is sliced from the end, after redaction, which only deletes bytes.exitCode, and shape-checks the reason against^[A-Za-z][A-Za-z0-9]{0,63}$first, so nothing that reached that state key from elsewhere can carry markdown or an arbitrary-length body onto a comment.message,podMessageandlogTailstay in the controller log._runnerPostMortemjoinsCONTROLLER_RESERVED_STATE_KEYS. A runner that could pre-set it would suppress its own post-mortem, since the capture is fenced on the key being absent, and would choose the text of the public failure comment.limitByteson the log read is a ceiling on the transfer, not the tail. The stream arrives oldest-first, so setting it to the tail size would discard the newest lines, which are exactly the crash.Also
WebSocket connection closednow carrieskind, plusrunIdandattemptIdfor a workflow-runner socket. A runner socket has nodaemonId, so an abnormal1006close, the shape a killed runner produces, previously could not be tied to the run it ended.Verification
bun run typecheck,bun run lint: cleanbun teston the four touched suites: 60 passcheck:docs-citations,check:docs-sync,check:env-contract,check:no-em-dashes: passOperator note
Needs
pods/loggetadded to the runner-namespace Role (docs/operate/deployment.md). Without it the capture degrades to the terminated container status alone and recordslogErrorsaying so.🤖 Generated with Claude Code
https://claude.ai/code/session_01TGnjV4sgzrDCVNznUQ1uuv
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