Separate certificate expiry alerts from connection failure rates
Renewal is noticed only when connections begin failing.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Observability
Estimated field mix
- Site reliability60%
- Security20%
- Networking20%
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 internal report exporter uses mutual TLS. Certificates are renewed manually, and operators cannot distinguish peer identity failures from network outages.
Setup prerequisites
- Generate disposable test-only certificate authorities and leaf certificates for loopback services; use no production keys.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Report remaining certificate lifetime.
- Distinguish leaf and trust-anchor expiry.
- Keep expiry observations separate from availability outcomes.
Implementation constraints
- Avoid private-key or full certificate dumps in generic logs.
Verification to include
- Observe a near-expiry leaf certificate.
- Show an expired CA distinctly from an unreachable peer.
Deliverables
- Certificate health metrics.
Rollout and recovery
Run read-only checks before wiring operational alerts.
Value of the work
For the engineer: Practice transport identity, trust-store changes, and certificate failure diagnosis.
For the team: Provide repeatable rotation and recovery behavior for authenticated service communication.
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.