Critical Flow Reliability Assessment
Know what is verified and what needs evidence.
After a Production Incident
Trace how dependencies, detection, recovery, and change interacted. Preserve the timeline and uncertainty before choosing an explanation.
Questions worth answering
- What is directly supported by the timeline?
- Which failure modes remain plausible?
- What would distinguish competing explanations?
The outcome to protect
Reduce repeat exposure. An untested explanation or a closed ticket does not prove resolution.
How we investigate
Reconstruct evidence, distinguish facts from hypotheses, review detection and recovery gaps, and design the next discriminating test.
Decisions & outcomes
- Evidence-linked incident timeline
- Failure modes and adjacent exposure
- Actions with closure and reverification criteria
Trace the missing notification without guessing the cause
A fictional scenario, not a customer result.
The question to resolveWas a completed renewal followed by one durable notification, or did the handoff lose work?
- Renewal committed
- Event handed off
- Notification worker
- Delivery receipt
Observed record
The reconstructed timeline contains a committed renewal and a missing notification receipt. It does not locate where the handoff failed.
- Evidence basis
- Observed
- Verification result
- Partially verified
- Freshness
- Fresh
Hypothesis
An interruption between committing the renewal and publishing its event could explain the symptom. That explanation remains an inference until discriminating evidence is gathered.
- Evidence basis
- Inferred
- Verification result
- Unverified
- Freshness
- Unknown
The resulting decision
Preserve the relevant timeline, test the handoff hypothesis in a safe environment, and give the resulting corrective action a measurable closure condition.
Scope of this example
This is a fictional incident review. A plausible explanation is not a confirmed cause, and an action list alone does not verify prevention.
Relevant service
Choose one critical flow.
Tell us what must work and what you need to know. We agree the scope before delivery.