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How the observation window changes an API error-budget result

Compare short and long windows while keeping traffic mix visible.
The same incident can dominate a one-hour result and barely move a monthly ratio. The denominator, traffic mix, and window answer different questions.
Google SRE material defines indicators, objectives, and error budgets. OpenTelemetry specifies HTTP metric attributes. Neither chooses an objective for a particular API.
Methodology: define eligible requests and success before querying telemetry. For one service revision, calculate requests and failures over hourly, daily, and 28-day windows. Break out routes, status classes, retries, regions, and low-volume groups. Record exclusions.
Scope and inference boundaries: the analysis describes captured requests. It can show sensitivity to window and traffic mix. It cannot measure unobserved failures, user satisfaction, compliance, or cause.
Limitations: sampling, missing spans, retries, bots, cancellations, and routing changes alter the ratio. Small groups are unstable. Service owners approve objectives, exclusions, alerts, and remediation.
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FAQ
What should happen first?
Begin with a bounded ticket, approved access, and a named reviewer.
Who approves production changes?
The company’s technical owner keeps final merge and release authority.