Django explicit support

[Chadys]

Hello, I was thinking it would be great to add explicit support for Django. Besides updating the documentation, it would be useful to provide a view so it can be added easily in the urlconf of a django app.

django-prometheus does it like this using generate_latest, but from looking at the already provided exposition endpoints, I was thinking of using the _bake_output utility instead.

I'm volunteering to make a PR for it.
What do you think?

[csmarchbanks]

There could be opportunity for this similar to what is done for twisted. Specifically, only optional dependency on django code and in a separate directory.

That said, is there a problem you are encountering with django-prometheus? Perhaps we just link out to other projects to make it easier to discover how to use Prometheus with various frameworks? Starlette also comes to mind.

[Chadys]

Yes I was thinking of following the same code architecture as the twisted support, to avoid any conflict.

To give you my context:

• I am not using django-prometheus currently (so I have no problem with it ^^): django-prometheus gives you lots of already configured metrics out of the box and that's its main use, whereas I was only trying to add one specific custom metrics to my existing django-app so prometheus-client seemed more than enough
• I found it hard to understand how to add a prometheus endpoint to my existing django app with no specific guidance in the prometheus-client documentation
• Hence I ended up looking at how django-prometheus was doing it, and also how it was done for other web-frameworks here (like twisted)

django-prometheus is kinda huge and does a lot of things, so linking it as an example on how to integrate with prometheus-client is a bit involved I think. A simple view calling _bake_output and some dedicated documentation would be very appreciated of those coming from django I think :)
Maybe in time the provided view might even be used by django-prometheus directly instead of having to provide their own.