So there is GitHub Scheduled Reminders: https://docs.github.com/en/organizations/managing-organization-settings/managing-scheduled-reminders-for-your-organizati

So there is GitHub Scheduled Reminders: https://docs.github.com/en/organizations/managing-organization-settings/managing-scheduled-reminders-for-your-organization https://docs.github.com/en/organizations/managing-organizati... , which has some serious limitations it seems (GitHub will only trigger reminders for up to five repositories per owner and 20 pull requests per repository. Reminders are not sent when changes are merged from upstream into a fork.).