Document the customer-visible degraded service contract
Product support cannot explain which features disappear during overload.
- Focused work estimate
- 1h + prerequisites
- Priority in the scenario
- Low
- Engineering practice
- Technical writing
Estimated field mix
- Site reliability70%
- API design30%
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
A fictional ticketing service becomes unresponsive during event releases because optional recommendation calls consume the same resources as reservation checks.
Setup prerequisites
- Build a bounded local service and synthetic open-loop workload generator with controllable dependency delays.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BLOADSHED-101 · Classify essential and optional ticketing requests
- BLOADSHED-102 · Build a workload that preserves offered arrival rate
- BLOADSHED-103 · Bound the waiting queue before worker slots are exhausted
- BLOADSHED-104 · Isolate optional recommendation concurrency
- BLOADSHED-105 · Propagate request deadlines to downstream work
- BLOADSHED-106 · Provide retry guidance that does not synchronize every client
- BLOADSHED-107 · Preserve fair access across tenant request queues
- BLOADSHED-108 · Compare rejection policies under the same offered workload
- BLOADSHED-109 · Prevent capacity oscillation when the burst ends
Acceptance criteria
- List omitted features and explicit failures.
- Describe recovery indicators without promising exact times.
- Include support diagnosis from safe metrics.
Implementation constraints
- No false success when essential work was rejected.
Verification to include
- Review a degraded response against the guide.
- Verify a failed reservation is never described as completed.
Deliverables
- Degradation guide.
Rollout and recovery
Ship alongside controls and update it when request classes change.
Value of the work
For the engineer: Practice overload behavior, admission control, and fair performance experiments.
For the team: Create predictable failure and degradation behavior under declared capacity constraints.
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.