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Adds readme entry on Plug.Telemetry (#20) 

* adds entry about Plug.Telemetry

* Adds reference to phoenix endpoint template
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Marco "Efesto" Polita 2021-10-01 18:30:49 +02:00 committed by GitHub
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instrumentation/opentelemetry_phoenix/README.md
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@ -27,3 +27,18 @@ def deps do
end end
``` ```
## Note on phoenix integration
`OpentelemetryPhoenix` requires phoenix to use `Plug.Telemetry` in order to correctly trace endpoint calls.
The `endpoint.ex` file should look like:
```Elixir
defmodule MyApp.Endpoint do
use Phoenix.Endpoint, otp_app: :my_app
...
plug Plug.Telemetry, event_prefix: [:phoenix, :endpoint]
...
end
```
The [Phoenix endpoint.ex template](https://github.com/phoenixframework/phoenix/blob/v1.6.0/installer/templates/phx_web/endpoint.ex#L39) can be used as a reference