Over at New Relic, we use the open source agent we have built. It comes with Plug transaction tracing, distributed tracing for micro-services, errors, BEAM stats, function tracing, custom attributes, alerting, etc.

In progress are a few framework integrations - Phoenix and Absinthe. Long term we want to align with the Elixir Telemetry project so we don’t need a bunch of vendor specific instrumentation packages in the ecosystem

I’ve been using Appsignal https://appsignal.com/

The product itself is excellent for both exception and performance monitoring, and the custom metrics are handy too. It’s also well priced too- switching over from New Relic saved us a lot of money.

I’ve pestered the Appsignal team plenty of times for help (or to obnoxiously request features!) and they’ve always been extremely helpful and responsive. Very happy with the service.

It currently has a bug where with cowboy 2 it reports 404s as errors, but that should be fixed soon.

I have been using Statix with Elixometer which all gets sent to Datadog (via their agent/dogstatsd), where we have our monitoring dashboards.

Also Honeybadger for error monitoring, and VictorOps for alerting.

However, just yesterday, I replaced Elixometer with vmstats in one of our applications (following a similar strategy to the one laid out in this blog post). I think I will be using vmstats going forward. It was much easier to set up than elixometer and requires much less configuration.