Gatus is a developer-oriented health dashboard that gives you the
ability to monitor your services using HTTP, ICMP, TCP, and even DNS
queries as well as evaluate the result of said queries by using a list
of conditions on values like the status code, the response time, the
certificate expiration, the body and many others. The icing on top is
that each of these health checks can be paired with alerting via
Slack, Teams, PagerDuty, Discord, Twilio and many more.

Homepage:
https://github.com/TwiN/gatus/
