Most outages aren’t “random.” They’re the predictable result of dependency blind spots—especially during change.
Where “unknown dependencies” hide
- Batch jobs, file drops, and legacy schedulers
- Point-to-point integrations and undocumented interfaces
- Shared databases and hidden read/write coupling
- Shared middleware, queues, and identity providers
- Operational dependencies (runbooks, on-call routing, vendor SLAs)
What to document (minimum viable)
- Upstream + downstream systems
- Interface type (API, batch, messaging, file)
- Failure behavior (retry, timeout, backpressure)
- Data criticality and recovery expectations
- Owner + escalation path
Outcome
Dependency clarity reduces surprise blast radius. It also improves release confidence because teams can predict
impact instead of discovering it in production.
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