Instrumentator Removes Causes from Exceptions

[lazyBisa]

Affected Version: 5.7.1

Description:

When an exception is thrown somewhere down the line, the Prometheus Instrumentator removes all cause information from the Exception.

Is this a deliberate design choice or an oversight?

Cause

The middleware is implemented like this: (instrumentation.py line 168-172)

            try:
                response = await call_next(request)
                status = str(response.status_code)
            except Exception as e:
                raise e from None

The from None removes information about what caused the exception.

Respective python docs: https://docs.python.org/3.8/reference/simple_stmts.html#raise