Calculate notification drain time under a channel rate limit
A launch generates a burst of alerts, but the architecture plan ignores provider quotas and retry traffic.
- Focused work estimate
- 5h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Queueing · Capacity analysis
Estimated field mix
- Performance engineering50%
- System design30%
- Integrations20%
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 collaboration tool sends email and in-app notifications. Duplicate alerts and preference changes reveal that the design has no single definition of delivery.
Setup prerequisites
- Create synthetic recipients, events and fake delivery providers.
- Do not send real email or messages.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- ANOTIFY-101 · Separate notification intent from channel delivery and human receipt
- ANOTIFY-102 · Specify recipient resolution without copying event payloads broadly
- ANOTIFY-103 · Choose when notification preferences are evaluated
- ANOTIFY-104 · Model notification intent and dispatch in one durable transaction
- ANOTIFY-105 · Design per-channel attempt identity and provider reconciliation
- ANOTIFY-106 · Bound notification fan-out without creating one huge transaction
Acceptance criteria
- Model initial backlog, arrival rate and provider throughput.
- Reserve capacity for retries within a bounded budget.
- Show conditions where backlog cannot drain.
Implementation constraints
- Use explicitly hypothetical rates and an executable calculation.
Verification to include
- Calculate drain time for a named burst and fixed delivery rate.
- Raise arrivals above capacity and report unbounded growth instead of a finite answer.
Deliverables
- Capacity calculator and quota assumptions
Rollout and recovery
Use results to propose admission and batching limits; replace assumptions before real rollout.
Value of the work
For the engineer: Practice asynchronous contracts, preference timing and delivery uncertainty.
For the team: Review a notification design that controls nuisance, disclosure and recovery.
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.