Sentry.set_user should work with OpenTelemetry

[sbeckeriv]

Issue Description

I have a rails 6 server with ruby 2.7. I must have 5.12 installed with the sentry rails to match. I have turned on performance (spans) recently. I wanted more information so i am following https://docs.sentry.io/platforms/ruby/performance/instrumentation/opentelemetry/ i have found that my Sentry.set_user data did not continue to work after moving over to opentelmetry.

After switching over the ui for performance shows ? for the user id.

Reproduction Steps

I do not have one. I am calling set_user in a normal controller flow. My configuration matches the doc https://docs.sentry.io/platforms/ruby/performance/instrumentation/opentelemetry/

Expected Behavior

I would expect set_user to report the user while using the OpenTelemetry configuration.

Actual Behavior

No user data is set. you can see event.user is empty in before_send_transaction callback.

Ruby Version

2.7

SDK Version

5.12

Integration and Its Version

Rails 6

Sentry Config

https://docs.sentry.io/platforms/ruby/performance/instrumentation/opentelemetry/ matches my configuration.

[sl0thentr0py]

note to self: this is likely because of some scope lifecycle shenanigans, try a repro and see how to fix

[sl0thentr0py]

hey @sbeckeriv this is due to how our scope management works, can you add the following in your opentelemetry initializer (where you configure the span_processor)?

Rails.application.config.middleware.move_after(
  Sentry::Rails::CaptureExceptions,
  OpenTelemetry::Instrumentation::Rack::Middlewares::TracerMiddleware
)

For now please use this, we have a longer plan to revamp our scope management completely so I don't want to mess with the current system too much. I will also add this to the documentation.

[mtomov]

Hi @sl0thentr0py ,

I think that with the switch to using Rack Events, this has stopped working again

https://github.com/open-telemetry/opentelemetry-ruby-contrib/tree/main/instrumentation/rack#rack-middleware-vs-rack-events
open-telemetry/opentelemetry-ruby-contrib#342

I disabled the Rack events, to re-enable the middleware:

OpenTelemetry::SDK.configure do |config|
  config.use_all({
    "OpenTelemetry::Instrumentation::Rack" => {use_rack_events: false}
  })
  config.add_span_processor(Sentry::OpenTelemetry::SpanProcessor.instance)
end

Rails.application.config.middleware.move_after(
  Sentry::Rails::CaptureExceptions,
  OpenTelemetry::Instrumentation::Rack::Middlewares::TracerMiddleware
)

which got the user association to work : )