LEARN. PRACTICE. GROW.Concept and mechanism
Release readiness combines technical evidence, applicable authorization, operational capability, and current conditions. Confirm owners for validation, communication, stop decisions, and recovery. Earlier approval does not remove the need to check contextual changes. Gradual exposure enables part of the service to be observed before expansion, but helps only when signals and traffic represent relevant behavior. Define groups, observation duration, and health criteria before execution. An error-free phase can remain inconclusive if the changed function was unused or volume was too small to reveal the expected effect.
Guided application
In a fictional scenario, an API passes read tests, but the release changes write processing that occurs only in the overnight batch. The plan should include evidence for that flow before generalizing confidence. If a phase reaches a stop threshold, halt expansion and coordinate investigation under the plan. Do not adjust the threshold solely to preserve an announcement date. The capability may need to remain disabled, scope may need reducing, or the window may need revision through appropriate authority. Communicate distinct states: package installed, limited exposure, validation ongoing, or recovery. Reporting should help business teams and APS know exactly which capability is available.
A green phase without relevant transactions can justify more observation rather than automatic expansion.
Common pitfalls
Canary treated as guarantee; overall average treated as every segment; window treated as health criterion; announcement treated as authorization.
Related topics: Scope, version, and outcome · Artifacts, integrity, and evidence · Sequence, capacity, and dependencies
Advance when evidence represents the service and meets agreed criteria.
Reference: Canarying releases · Google SRE release and canary guidance; GitHub immutable releases and GitLab release evidence and deployment safety; DORA five-metric model; inspected 2026-10-01