(request) Decompression middlewares should emit metric for decompression usage

[petrroll]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe the problem.

I'm trying to find out how often decompression middleware is engaged and it'd be very useful to have a metric that reports how often each of the providers is engaged.

Describe the solution you'd like

Inbuild metric for decompression middleware that reports how often each provider is engaged.

Additional context

No response