[ATO-2609] Add gRPC tracing

[radovanZRasa]

Add tracing between Rasa and action server.

Status (please check what you already did):

• made PR ready for code review
• added some tests for the functionality
• updated the documentation in the rasaHQ/rasa
• updated the changelog (please check changelog for instructions)
• reformat files using black (please check Readme for instructions)

[Tawakalt]

@radovanZRasa We should do a quick check that this works with grpc as well.

[ancalita]

@radovanZRasa Do we know what are the errors in the screenshot you shared in the PR description? Referring to the spans with exclamation mark next to them.

[radovanZRasa]

@radovanZRasa Do we know what are the errors in the screenshot you shared in the PR description? Referring to the spans with exclamation mark next to them.

Yea, I was testing Rasa with CALM bot from calm-demo-bot and action server from simple NLU bot because I did not want to lose time to install necessary dependencies for CALM bot's actions in my Rasa SDK virtual env. I only wanted to verify that tracing works.

[Tawakalt]

@radovanZRasa Do we know what are the errors in the screenshot you shared in the PR description? Referring to the spans with exclamation mark next to them.

It's most likely the missing domain error log that should now be fixed.

[radovanZRasa]

@radovanZRasa Do we know what are the errors in the screenshot you shared in the PR description? Referring to the spans with exclamation mark next to them.

It's most likely the missing domain error log that should now be fixed.

They will also appear in this case. Good thing is that all calls are logged so everything is there.

As image shows all calls are recorded.

For failed call, log indicates that domain was not found:

[radovanZRasa]

@radovanZRasa We should do a quick check that this works with grpc as well.

I added custom action AddContact and added tracing into it:

from typing import Any, Dict
from rasa_sdk import Action, Tracker
from rasa_sdk.events import SlotSet
from rasa_sdk.executor import CollectingDispatcher
from rasa_sdk.tracing.tracer_register import ActionExecutorTracerRegister

class AddContact(Action):
    def name(self) -> str:
        return "add_contact"

    def run(
        self, dispatcher: CollectingDispatcher, tracker: Tracker, domain: Dict[str, Any]
    ):
        tracer = ActionExecutorTracerRegister().get_tracer()
        with tracer.start_as_current_span("AddContact.add_contact"):
            return [SlotSet("return_value", "success")]

Verified: