Handle registry unavailability without changing artifact identity
A failed digest lookup falls back to the latest cached tag.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Resilience · Integrity
Estimated field mix
- Cloud infrastructure40%
- Site reliability40%
- Security20%
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 application team deploys mutable image tags and cannot reliably identify the artifact running during an incident.
Setup prerequisites
- Author synthetic artifact manifests and a local registry double; do not pull or execute untrusted images.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- BARTIF-101 · Resolve deployment references to immutable artifact digests
- BARTIF-102 · Record build inputs without exposing build secrets
- BARTIF-103 · Reject promotion of artifacts with unresolved policy findings
- BARTIF-104 · Keep environment-specific settings outside immutable application bytes
- BARTIF-105 · Bind a promotion decision to current environment state
Acceptance criteria
- Use cached data only for the exact verified digest.
- Return unavailable for unresolved references.
- Bound fetch retries and response size.
Implementation constraints
- Do not substitute another release during failure.
Verification to include
- Reuse a verified digest manifest.
- Fail tag resolution during outage without selecting latest.
Deliverables
- Registry failure handling.
Rollout and recovery
Keep current release running in the scenario; retry promotion explicitly.
Value of the work
For the engineer: Practice artifact identity, promotion policies, and release provenance.
For the team: Provide reproducible deployments and a clear path to withdraw defective artifacts.
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.