Rehearse gateway restart during incident coordination
The team has not tested what room users see during a gateway restart. Create a repeatable drill with one pending claim, a disconnected reader, and a recently revoked member.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Failure testing · Operational readiness · Observability
Estimated field mix
- Real-time systems40%
- Site reliability30%
- Quality engineering30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
The fictional Harbor operations team coordinates synthetic incidents in a shared room. Engineers post status notes and claim response tasks while connections come and go. Scope is one application gateway, a durable room event store, and fixture clients; alert paging and external chat delivery are excluded.
Setup prerequisites
- Room membership and command contracts
- Synthetic incident events and a controllable transport harness
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- LIVE-101 · Show the difference between connected and caught up
- LIVE-102 · Reject malformed room events before they reach the reducer
- LIVE-103 · Authorize room subscription before replaying its history
- LIVE-104 · Stop duplicate and out-of-order notes confusing the timeline
- LIVE-105 · Recover when a reconnect cursor is older than retained history
- LIVE-106 · Reconcile a task claim when its acknowledgement is lost
- LIVE-107 · Expire disconnected presence without rewriting incident history
- LIVE-108 · Cut off room delivery when membership is revoked mid-replay
- LIVE-109 · Keep one slow room client from exhausting gateway memory
Acceptance criteria
- The drill records final durable event IDs, sequence, task owner, and subscription count.
- Restart recovery neither duplicates the claim nor grants the revoked member replay access.
- The runbook defines safe metrics and a rollback action without logging private note bodies.
Implementation constraints
- Restart only disposable practice processes and use synthetic room content.
Verification to include
- Run the restart drill twice from the same fixture and compare final authoritative room state.
- Make the event store unavailable during reconnect; clients remain explicitly stale/read-only and no command is falsely confirmed.
Deliverables
- Gateway restart drill and incident-room operator runbook
Rollout and recovery
Require the drill before pilot expansion; keep room writes disabled if durable replay or authorization recovery is unavailable.
Value of the work
For the engineer: Practice event identity, ordering, replay, authorization, and bounded backpressure in one understandable system.
For the team: Inspect how an engineer keeps collaborative state trustworthy during failures without relying on optimistic success messages.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.