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How to Correlate Deployments and Incidents

Correlating incidents with deployments is a repeatable discipline: collect evidence, score candidate deploys, and validate causality. This guide presents a reproducible workflow for engineers.

What is correlation between deployments and incidents​

Correlation is aligning incident signals (alerts, logs, traces) with deployment metadata (artifact, commit, time) to identify whether a deployment likely caused the incident.

Why this problem happens​

  • Inconsistent metadata: deploys may not record artifact ids in monitoring systems.
  • Long detection windows: incidents discovered later complicate attribution.
  • Multiple overlapping deploys: several releases in a short window make causal inference hard.

How engineers debug this​

  1. Anchor to incident onset time and collect nearby deploy timestamps.
  2. Filter candidate deploys by affected service and environment.
  3. Check commit diffs and risky change patterns (database migrations, feature toggles).
  4. Look for matching traces or error messages that first appear after the candidate deploy.
  5. Score candidates and prioritize investigation; validate by rollback or targeted mitigation if evidence is strong.

Best practices​

  • Emit deployment markers to monitoring systems during rollout.
  • Keep concise deploy metadata attached to each release for easy lookup.
  • Use short canaries and automated post-deploy checks to provide quick signals

Tools that help​

OctoLaunch automates much of this process: it collects deploy markers, aligns them with incidents, ranks candidate deploys, and surfaces the minimal set of commits that could be responsible.

FAQ​

  • Q: How does OctoLaunch decide which deploys are likely responsible?
    • A: OctoLaunch weights timing overlap, affected services, and recent CI anomalies to rank candidate deploys.
  • Q: What if multiple deploys are candidates?
    • A: Investigate in order of rank and prioritize mitigation that minimizes user impact while preserving evidence.
  • Q: How do I avoid noisy deploy markers?
    • A: Emit structured markers only when releases reach meaningful rollout milestones (canary, full, rollback).

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