Issue and PR Labeler workflow (dask/dask)

The Issue and PR Labeler workflow from dask/dask, explained and optimized by Latchkey.

What it does

This is the Issue and PR Labeler workflow from the dask/dask repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-3-Clause license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

name: "Issue and PR Labeler"
on:
  pull_request:
    types: [opened]
  issues:
    types: [opened, reopened]
jobs:
  label-all-on-open:
    runs-on: ubuntu-latest
    steps:
      - uses: andymckay/labeler@1.0.4
        with:
          add-labels: "needs triage"
          ignore-if-labeled: false

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: "Issue and PR Labeler"
on:
  pull_request:
    types: [opened]
  issues:
    types: [opened, reopened]
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  label-all-on-open:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
      - uses: andymckay/labeler@1.0.4
        with:
          add-labels: "needs triage"
          ignore-if-labeled: false
 

What changed

• Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
• Cancel superseded runs when a branch or PR gets a newer push.
• Add a job timeout so a hung step cannot burn hours of runner time.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.