Add Failed state

I use Serilog.Timings to log the outbound HTTP calls and those can be completed, abandoned and failed (at least, for us): the difference between “completed” and “failed” is the one between successful and unsuccessful HTTP status code.

So what I would like to have is the ability to

1. have different outcomes in the log (“completed” and “failed”)
2. differentiate them by the log level

All of this can be (quite easily, but a bit messily) achieved by adding an overload to Complete accepting log level and outcome, or if we want more “graceful” solution - by adding another method very similar to Complete.

I can do a PR for whichever solution you prefer.

[srogovtsev]

I will try picking up AddProperty either today or tomorrow, I like the idea. The only thing that is missing is logging the exception, but that can be remedied by adding similar SetException.

[nblumhardt]

Odd - looks like pre-release package publishing is broken. I’ll have a look shortly - the dev branch builds should be published to NuGet.