You can use Uptime Kuma. It's just 1 container with an SQLite database. It shows outages, uptime, and can sent notifications about service status.

You can use Uptime Kuma. It's just 1 container with an SQLite database. It shows outages, uptime, and can sent notifications about service status.

you can also try Checkmate https://github.com/bluewave-labs/Checkmate
I am currently setting up munin on my servers.
I like it so far - it's old-school, lightweight and straightforward.
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