chore(messenger): add trace parent in dispatched messages (AMQP)

[jvocampings]

Hello,

I'd like to submit to you that PR.

Handling propagation of trace in AMQP context by adding custom stamp to dispatched messages. The stamp contains the trace parent normalized by OpenTelemetry. It does not read the stamp from incoming message (must be done in another PR or in this one if you prefer).

An exemple with a message dispatched to RabbitMQ:

X-Message-Stamp-FriendsOfOpenTelemetry\OpenTelemetryBundle\Instrumentation\Symfony\Messenger\TraceStamp: [{"traceParent":"00-57cdad60c0711de6da2ab8814fc91e36-c6bb8daefdd291b0-01"}]

Add the middleware open_telemetry.instrumentation.messenger.propagation.amqp.middleware to your bus to activate it. e.g.

buses:
    messenger.bus.default:
        middleware:
            - open_telemetry.instrumentation.messenger.propagation.amqp.middleware

I prefer writing tests once modifications are OK for you. But I can add them asap if you prefer.

[gaelreyrol]

Thank you very much for your involvement on this bundle, I really appreciate it!

First, I think this can fully generic. I mean, why restricting this to AMQP as long as the stamp is serializable.

On the propagation aspect, I need to do some research to make sure I fully master this part before implementing it otherwise I will not be able to provide support and extend it.

Are you in a hurry to get this working? I am not sure I will be able to work on this until this week-end.

[jvocampings]

First, I think this can fully generic. I mean, why restricting this to AMQP as long as the stamp is serializable.

In a Messenger middleware, I know I can check if the message is dispatched if it has the AmqpStamp. I don't know any generic way to check that.

Are you in a hurry to get this working? I am not sure I will be able to work on this until this week-end.

I'm not in a hurry. Thank you :)
I know the ecosystem is still young so don't worry.

[gaelreyrol]

In a Messenger middleware, I know I can check if the message is dispatched if it has the AmqpStamp. I don't know any generic way to check that.

You can check if a TraceableStamp has already been applied or not, without considering if it has been dispatched.

I'm not in a hurry. Thank you :) I know the ecosystem is still young so don't worry.

Thanks! I'll do my best to come to you as soon as I covered the subject in my mind 😅 .

[gaelreyrol]

Hi @jvocampings, I think this PR should be merged with #173 to facilitate the instrumentation of the messenger component.

[jvocampings]

Hi @jvocampings, I think this PR should be merged with #173 to facilitate the instrumentation of the messenger component.

yes done: #173