| > Elixir would create a telemetry Erlang `telemetry` is something different from OpenTelemetry. > Phoenix (and other libraries like Ecto, etc.) would use it And this is a fact. Both Plug, Phoenix, and Ecto are using Erlang's Telemetry library. > And the end goal was to have a Phoenix web UI that would come out of the box that you could goto and see a bunch of really useful things about your server's health This will probably be implemented as an external library in form of OpenTelemetry as I said. > Did all of that get scratched for OpenTelemetry? No, OpenTelemetry and Erlang's Telemetry have different goals. Erlang's Telemetry is meant to be lightweight metrics logging library with API for defining exposed metrics. OpenTelemetry is the OTP application that will ingest these metrics and will expose them to the external services like DataDog or Prometheus. > The official website at https://opentelemetry.io/ doesn't show Elixir as being a supported language. [Not all languages are listed on the website](https://github.com/open-telemetry/opentelemetry-erlang). |