Hey @NiklasMerz, first of all thanks for putting your time into this.
I think this is a great start. The only thing that i think it's missing is, the DRF integration will not be catched on this middleware, right?

Good point. In my testing normal class-based views and a function base view with @api_view(["GET"]) work so far. I will have a look.

Also, this Catch all middleware is only applying the metrics. The Error tracing, you think as a separate middleware?

Hey @NiklasMerz, first of all thanks for putting your time into this. I think this is a great start. The only thing that i think it's missing is, the DRF integration will not be catched on this middleware, right?

I added code to also track DRF requests. Seems to work fine in my project.

Also, this Catch all middleware is only applying the metrics. The Error tracing, you think as a separate middleware?

Having one Middleware to do everything automagically in the background sounds good to me. I could also extend the ErrorTracingMiddleware to make this work. What do you think?

I think that this Inheritance will make it less clear what the middleware is actually doing.
Maybe we can leave the CatchAllMiddleware without any Inheritance, and create the others middlewares instances on __init__, then on process_exception/__call__ just call the both middlewares there.

I am not entirely sure what you mean, but feel free to refactor my branch as you like. I quite like the inheritance for solving this and making it clear is just a matter of documentation. But the code has to be maintainable, so we can make it as you prefer.

I added some documentation of the new middleware to README.

@leandrodesouzadev What do you think? Do you want to change the code or should I refactor it?

Little ping @leandrodesouzadev. Is there anything I can do to move this PR forward?

Hey @NiklasMerz sorry for not giving attention to this.

Maybe something like this (haven't tested it):

class CatchAllMiddleware:
    def __init__(self, get_request):
        others = [ApmMetricsMiddleware(get_request), ErrorTraceMiddleware(get_request)]

    def __call__(self, request):
         for other in others:
              other(request)