Check out the Repo and Readme on GitHub: Ceres on Github
I built Ceres as part of my time with the Campus Web Services team at the University of Arizona to monitor our vast portfolio of sites. Ceres pays attention to the site connection over HTTP and if it detects a problem it will log the potential outage in a DynamoDB table and notify a specified Slack Channel. Once it detects the end of the potential outage it will update the database entry and notify the channel again.
Ceres is built to be deployed using Terraform on Amazon Web Services and coded primarily in Python.
Pull requests welcome :)
Image Credit: https://www.space.com/22891-ceres-dwarf-planet.html