Measure delivery with the DORA metrics over 90 days

How to do it

These numbers show whether the team can ship a fix in hours or needs weeks. Take them from the data, not from interviews. Lead time runs from commit to running in production. A failed deployment is one that needed a rollback or a hotfix at once. Rework rate is the share of deployments that were unplanned and caused by a production incident. Compare the figures with the team's own claims and with Build releases only in CI and verify them before deploy. A team that deploys by hand from a laptop has no reliable history, and that is the finding.

Examples

Python example

from datetime import timedelta
from statistics import median

def dora(deploys: list[dict], days: int = 90) -> dict:
    failed = [d for d in deploys if d["needed_intervention"]]
    return {
        "deploys_per_day": len(deploys) / days,
        "median_lead_time": median(d["deployed_at"] - d["committed_at"] for d in deploys),
        "change_fail_rate": len(failed) / len(deploys),
        "median_recovery": median((d["recovered_at"] - d["deployed_at"] for d in failed), default=timedelta(0)),
        "rework_rate": sum(d["unplanned_after_incident"] for d in deploys) / len(deploys),
    }

JavaScript example

const median = values => values.sort((a, b) => a - b)[Math.floor(values.length / 2)] ?? 0

function dora(deploys, days = 90) {
  const failed = deploys.filter(d => d.neededIntervention)
  return {
    deploysPerDay: deploys.length / days,
    medianLeadTimeMs: median(deploys.map(d => d.deployedAt - d.committedAt)),
    changeFailRate: failed.length / deploys.length,
    medianRecoveryMs: median(failed.map(d => d.recoveredAt - d.deployedAt)),
    reworkRate: deploys.filter(d => d.unplannedAfterIncident).length / deploys.length,
  }
}

How to check

The report gives all five metrics with the date range and the data source of each. A script recomputes them from the exported commit and deploy records and gets the same numbers.

Sources

• DORA software delivery performance metrics

Related rules

• ENG-11 Build releases only in CI and verify them before deploy in Engineering