Add elapsedMs parameter to the EnrichDiagnosticContext delegate

[jmenziessmith]

Is your feature request related to a problem? Please describe.
I want to use the diagnostic context to log a structured object containing enhanced request information. I would like this to include the elapsed duration, but the value is not accessible outside of the middleware. I believe this is a simple fix, to just include the elapsedMs value as a parameter to the EnrichDiagnosticContext action.

Describe the solution you'd like

RequestLoggingMiddleware.cs#L30

readonly Action<IDiagnosticContext, HttpContext>? _enrichDiagnosticContext; // current
readonly Action<IDiagnosticContext, HttpContext, double>? _enrichDiagnosticContext; // proposed

RequestLoggingMiddleware.cs#L85

_enrichDiagnosticContext?.Invoke(_diagnosticContext, httpContext); // current
_enrichDiagnosticContext?.Invoke(_diagnosticContext, httpContext, elapsedMs); // proposed

Describe alternatives you've considered
n/a

Additional context
n/a

[nblumhardt]

Thanks for dropping us a line!

How does the duration you want to pass through the IDiagnosticContext differ from the one computed by the middleware?

[jmenziessmith]

Hi. Thanks for the quick reply.

I don't expect the duration to differ - I would expect the same value. The desire is to be able to access that value when enriching the DiagnoticContext.

[nblumhardt]

Ah sorry, I see I misunderstood 😅 - thanks for the clarification.

[jmenziessmith]

@nblumhardt I have raised a PR with an alternative solution in order to avoid introducing breaking changes to the EnrichDiagnosticContext action.

#391