Filter processor

[psd2ibanity]

Hi,

We have successfully integrated OpenTelemetry libs into our Elixir code. As the default configuration states, we have only one processors for traces, which is :batch (otel_batch_processor). I was wondering if it's either already possible, or will be possible one day, to use other processors, especially filter/transform processor (https://opentelemetry.io/docs/collector/transforming-telemetry/) in order to clean sensitive attributes from our traces?
Thanks

[tsloughter]

Sadly processors in the collector (what you linked to) and in the SDK are different, but similar.

While you can today define multiple processors in your Elixir config you can't transform/filter the spans OnEnd, by spec design. In https://github.com/open-telemetry/opentelemetry-erlang-contrib/blob/bc11851360ce7b4ca73de7ea544b503366e7e118/examples/basic_elixir/config/releases.exs you can see how processors is configured as a list, but the returned Span in one processors OnEnd is no passed to OnEnd of the next processor in the list, so filtering/transforming would be lost.

There has been off and on discussion on how to add such functionality to the Spec, see

open-telemetry/opentelemetry-specification#3189

and

open-telemetry/opentelemetry-specification#1089

[psd2ibanity]

Thank you for the complete answer.