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BSLO-101 · Define indicators

Define eligible checkout attempts and successful completion

Practice briefTaskFoundational

Availability reports count health checks as customer success.

Focused work estimate
1h + prerequisites
Priority in the scenario
Medium
Engineering practice
SLI design

Estimated field mix

  • Site reliability100%

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 checkout service reports process uptime while customers experience failed orders and slow confirmations.

Setup prerequisites

  • Create synthetic request and order-event traces plus a local query or metrics fixture; no production telemetry required.

Preceding work

No earlier ticket is required. Complete the project setup above.

Acceptance criteria

  • Define eligible attempts and completion deadlines.
  • Exclude synthetic probes from customer denominators.
  • Document validation failures and abandoned checkouts separately.

Implementation constraints

  • Do not exclude service failures to improve the ratio.

Verification to include

  • Classify representative success and failure traces.
  • Reject a denominator that includes only completed orders.

Deliverables

  • SLI event contract.

Rollout and recovery

Review event semantics before publishing an objective.

Value of the work

For the engineer: Practice SLI semantics, alert evaluation, and reliability tradeoffs.

For the team: Align reliability discussions with customer outcomes and explicit measurement limits.

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.