CI/CD & DevOps Practices Practice Question 5: DORA Change Fail Rate
CI/CD & DevOps Practices · Test 1 · question 5 of 10
At a quarterly review, a team reports: "We made 40 planned production deployments this quarter. 6 of them degraded service and needed immediate intervention, either a rollback or an urgent fix." The team wants to track the figure "6 out of 40" using DORA's software delivery metrics.
Which DORA metric does this figure measure?
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Answer:
DORA defines change fail rate as the ratio of deployments that require immediate intervention after the deployment. Six of the forty planned deployments needed a rollback or urgent fix, so the change fail rate is 15% (D).
Option A, deployment frequency, counts how many deployments happen in a period (40 this quarter). It does not measure whether those deployments failed.
Option B, failed deployment recovery time, measures how long it takes to recover from a failed deployment. It is a duration, not a ratio. This metric replaced DORA's earlier "time to restore service" (MTTR).
Option C, deployment rework rate, is the ratio of deployments that are unplanned and happen because of a production incident. It counts the urgent fix deployments themselves, not the six planned deployments that caused the trouble. Rework rate is the newer fifth DORA metric; together with change fail rate it makes up DORA's instability measures.
Reference: DORA's software delivery performance metrics (dora.dev)