Wanted to throw logflare.app on this thread 
Built in Elixir … about to launch v1. Our logger backend is: GitHub - Logflare/logflare_logger_backend: Logger backend to send Elixir logs to Logflare. · GitHub
@slouchpie should be a drop-in replacement if you want to try it.
Not only do we have alerts, tailing, an easy query language, etc. in our UI but I use it to power this dashboard for our Elixir backend (which I use daily for monitoring): Logflare Backend Status v2
