Workflows
Concurrency group
Quick answer
A concurrency group is a named lock that limits how many workflow runs matching that name can be in progress at once.
A concurrency group is a named lock that limits how many workflow runs matching that name can be in progress at once.
Why it matters
Combined with cancel-in-progress, it is the single highest-leverage cost control in GitHub Actions: superseded pushes stop burning minutes on results nobody will read.
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Related
Artifact retentionArtifact retention is the period GitHub keeps workflow artifacts before deleting them, defaulting to 90 days and configurable per repository or per upload.Build matrixA build matrix is a GitHub Actions feature that expands one job definition into many parallel jobs across combinations of variables such as OS and language version.Composite actionA composite action bundles several workflow steps into a single reusable action defined in YAML, without needing JavaScript or a container.Container jobA container job runs all of a job's steps inside a specified container image rather than directly on the runner.