Riccardo Magliocchetti

> Fixes #2405 That is for httpx

> @xrmx Other implementations like the django one, make use of [this function](https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/opentelemetry-instrumentation/src/opentelemetry/instrumentation/utils.py#L118) that I believe it implies that if there's no active span it should extract the context from...

You need `mysql_config` or `mariadb_config` that are usually shipped with development libraries of the database, e.g. `libmariadb-dev`.

@malcolmrebughini please rebase and move the changelog update to the unreleased section

@andy-edvalson please fix `tox -e lint` and `tox -e docs`

Thanks for the PR, care to add a test too?

> Is it essential to add test code to add a mere line of logging? It's not essential of course, but it'll help :)

> Moreover, if multiple workers run using gunicorn, the warnings will be logged more than once even if we use `warnings.warn`. This will warn at each request not for each...

Logs are gone, locally this is failing ~because of no cryptography wheel is found (maybe too old pypy, they should be available) and~ because of regex dependency is not available...

Would be interesting to see if this is reproducible with pypy 7.3.16 after #2559. That version is 3.9+ so cannot be used right now unfortunately.