Where does opentelemetry.propagate come from?

[cmeiklejohn]

I've noticed several of the instrumentation libraries seem to pull in opentelemetry.propagate (for example, opentelemetry-instrumentation-flask, but when I try to find the actual package that's providing that import -- or, even look at the code -- I can't seem to locate it.

Can someone point me to this?

Updated: I'm trying to write my own instrumentation for a custom framework we are developing as part of our research and I'm trying to base it on how this instrumentation works, but I'm stuck trying to find the python packages that provide the following:

from opentelemetry.propagate import extract
from opentelemetry.util._time import _time_n

In my application, I'm using the following packages (in my requirements.txt), but I still cannot locate those imports:

opentelemetry-sdk
opentelemetry-api
opentelemetry-trace
opentelemetry-instrumentation
opentelemetry-exporter-jaeger
opentelemetry-instrumentation-flask
opentelemetry-instrumentation-requests

However, the instrumentation for Flask and Requests seem to work fine, if I try using them on a vanilla application, so I know that the imports are there somewhere.

I also tried downloading the actual package from Pypi here. When I untar this, I don't see a requirements file pointing me to the correct location of where this might be coming from; nor, do I find any implementation of these either.

Thanks for your help.

[cmeiklejohn]

Disregard, I was looking at the unreleased opentelemetry-instrumentation-flask (while running 0.18, which doesn't use the propagators change yet.)

[owais]

Updated: I'm trying to write my own instrumentation for a custom framework we are developing as part of our research and I'm trying to base it on how this instrumentation works

@cmeiklejohn I'd suggest to not write an external instrumentation for your own framwork but instrument your framework with Otel API directly. That way it won't need any instrumentation or runtime patches. This is certainly the recommended way to instrument libraries.

[owais]

I think I misunderstood what you meant. Please ignore if that's the case.