mark-stale-PRs.yml

# This workflow warns of PRs that have had no activity for a specified amount of time.
#
# For more information, see https://github.com/actions/stale
name: Mark stale pull requests

on:
  # Run every day at 00:00 UTC
  schedule:
  - cron: '0 0 * * *'
  # Or run on demand
  workflow_dispatch:

jobs:
  stale:
    runs-on: ubuntu-latest

    permissions:
      pull-requests: write

    steps:
      - uses: actions/stale@v5
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}

          days-before-pr-stale: 14
          days-before-issue-stale: -1   # don't mark issues as stale
          exempt-draft-pr: true         # don't mark draft PRs as stale

          days-before-close: -1         # don't close stale PRs/issues

          stale-pr-message: >
            This PR has not had activity in the past 2 weeks, labeling it as stale.
            If the PR is waiting for review, notify the dev@lucene.apache.org list.
            Thank you for your contribution!

          debug-only: false             # turn on to run the action without applying changes
          operations-per-run: 500       # operations budget

# The table shows the cost in operations of all combinations of stale / not-stale for a PR.
# Processing a non-PR issue takes 0 operations, since we don't perform any action on it.
#
#                            +-----------------------+
#            number of       |  state after workflow |
#           operations       +-----------+-----------+
#                            |   stale   | not stale |
#     +----------+-----------+-----------+-----------+
#     |  state   |   stale   |     3     |     4     |
#     |  before  +-----------+-----------+-----------+
#     | workflow | not stale |     5     |     1     |
#     +----------+-----------+-----------+-----------+