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Make API integrations resilient to outages
Map dependencies, bound retries and keep essential journeys usable during external failures.
· 18 min
What this guide helps achieve
- Connect APIs to business journeys
- Bound calls and retries
- Plan degraded operation
- Measure recovery
Quick check
- Which journeys depend on each provider?
- Does every call have a timeout?
- Could a retry duplicate an operation?
- What does the user see during failure?
- Who approves return to normal service?
Step-by-step method
- 01
Map calls
Connect every integration to exchanged data, contracts, owners and journey steps. Identify synchronous calls that block the user.
Deliverable: prioritised dependency map.
- 02
Set time budgets
Define a timeout for each call and a total budget per journey. Prevent service chains from multiplying wait times.
Deliverable: timeout and threshold matrix.
- 03
Bound retries
Retry only operations safe to repeat. Test idempotency, cap attempts and spread them with suitable backoff.
Deliverable: tested retry policy.
- 04
Plan degraded operation
Decide what remains usable, which data may be queued and what clear message appears during an outage.
Deliverable: fallback behaviour per journey.
- 05
Simulate incidents
Introduce latency, invalid responses and outages in a controlled environment. Check load, data, interface and restoration.
Deliverable: failure test results.
- 06
Watch outcomes
Track errors, latency, queues and business actions actually lost. Assign escalation and supplier coordination owners.
Deliverable: dashboard and recovery procedure.
Management indicators
| Indicator | What it measures | First action |
|---|---|---|
| Mapped journeys | Essential journeys with known dependencies | Assign owners to unknown calls |
| Time budget | Calls within the journey deadline | Review chained waits |
| Safe retries | Repeated operations without side effects | Add idempotency or remove retry |
| Tested degradation | Outage scenarios with observed user result | Improve continuity and communication |
Common pitfalls
- Retrying without limit against an overloaded service
- Repeating a non-idempotent write
- Hiding an outage behind unlabelled stale data
- Measuring only provider response rate
Frequently asked questions
Should every request be retried?
No. Retries help selected transient failures and must respect the overall deadline, idempotency and provider load.
Is a circuit breaker sufficient?
It protects some calls, but does not define the user experience or recovery of queued work.
What should be measured first?
Effects on essential journeys: duration, lost or delayed actions and recovery quality.
Official references
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