18 lines
643 B
Markdown
18 lines
643 B
Markdown
# ADR-0038: Versioned SLO and error-budget model
|
|
|
|
## Status
|
|
|
|
Accepted in M14 on 2026-08-27.
|
|
|
|
## Decision
|
|
|
|
Separate immutable SLI definitions from versioned SLO policies and immutable evaluation snapshots.
|
|
Only production policies receive error budgets. Minimum population and freshness are evaluated
|
|
before health; short and rolling-window burn rates remain distinct.
|
|
|
|
## Consequences
|
|
|
|
Threshold changes cannot rewrite historical meaning. LAB evidence cannot masquerade as production
|
|
reliability. A serving capability can consume budget without being misreported as unavailable, and
|
|
too little evidence remains explicitly `INSUFFICIENT_DATA`.
|