Define alerting rules, route them to email or webhook, suppress duplicates, track acknowledgments. PagerDuty for teams who want on-call without the $17/user/mo.
Unlimited rules, webhook targets, escalation policies, on-call schedules. Self-hosted on your hardware, no usage caps, no phone-home, your data stays on disk forever.
One ~13MB binary. No Docker, no dependencies, no background daemons.