GitHub Actions Cron Schedules Unreliable on Free Tier, Community Analysis Finds

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A development team using GitHub's free tier experienced unreliable scheduled workflows despite correct configuration. Their GitHub Action, set to run hourly, missed seven out of eight expected executions on a critical day, with the sole run arriving significantly late. The incident highlights that GitHub explicitly designates cron scheduling as 'best-effort,' particularly for free accounts and during high platform load. A key diagnostic challenge is that GitHub's API cannot report missed cron opportunities, only created runs. This behavior can disrupt software planning and release cycles for teams relying on automation.

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