Add metrics for failed requests

[lukasz-leszczuk-airspace-intelligence]

Describe the feature request

I want to know what error status codes (4xx|5xx) were returned by edge, so that I can fine tune monitoring and runbooks.
Currently those are explicitly ommited (

unleash-edge/server/src/metrics/actix_web_metrics.rs

Line 370 in d93c28d

// Ignore actix errors for metrics

), but I believe would still provide much value in speeding up debugging process.

Background

No response

Solution suggestions

Move metrics update before if let Ok(res) = res {} block

[nunogois]

Hey @lukasz-leszczuk-airspace-intelligence, thanks for raising this issue! I'll reach out to the rest of the team and we'll get back to you.