jarvis-at-skic
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37 lines
2.2 KiB
Plaintext
37 lines
2.2 KiB
Plaintext
---
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id: change-lead-time
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slug: /measurement/change-lead-time
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title: Change lead time
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description: Definition, collection evidence and limitations for change lead time.
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---
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<div className="strategy-content">
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**Target operating model — recommended contracts, not installed collection.** All owner and cadence entries below are proposals to confirm before the pilot, not assigned responsibilities or approved schedules.
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**Unimplemented metric — no live telemetry.** This is a prospective contract, not an implemented calculation or collector.
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{/* contract:start */}
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Arithmetic mean commit-to-first-successful-production-deployment duration; also publish median/p90 and sample count.
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| Contract | Definition |
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| --- | --- |
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| Numerator | Sum of elapsed hours from committed_at to first successful production deployment for each service+commit |
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| Denominator | Count of eligible service+commit pairs with valid mappings |
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| Expression | N / D |
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| Aggregation | mean |
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| Unit | hours/change |
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| Eligible population | Changes first successfully deployed to a service in reporting window; rollout retries collapse to same logical deployment. |
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| Exclusions | Nonproduction, duplicates, no-op deployment with no new commits; missing mappings shown as coverage loss. |
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| Events and source | change.committed; deployment.completed; VCS immutable commit timestamps and release manifest |
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| Owner / cadence | Platform & IT / Weekly per service |
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| Missing evidence | Missing commit mapping or negative/skewed duration excluded from numeric sample, reported explicitly; no zero substitution. |
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| Gaming and limits | Timestamp rewriting and cherry-picking fast work; lock change mapping and show undeployed backlog age. Descriptive signal, not causal AI productivity attribution. Source completeness, task mix and sampling limit inference; report uncertainty. Not PR cycle time, effort saved, or a complete view of unfinished changes. p90 uses nearest-rank sorted sample. |
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{/* contract:end */}
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Read the shared [collection and safeguards](./collection-and-safeguards.mdx) before collecting data; see the [synthetic example and limits](./synthetic-example.mdx).
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Return to [Skills Measurement](./index.mdx).
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</div>
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