Record `Exception.Data` when calling `RecordException`

Feature Request

Has there been an consideration of recording values from an exception’s Data property as tags on the event when calling activity?.RecordException(ex)?

Describe the solution you’d like:

I would like to add key/value data to certain exceptions beyond just a message. It would be useful to record this extra data when the exceptions are caught.

Describe alternatives you’ve considered.

The extra data can obviously be recorded manually, but it seems natural to include this functionality in the RecordException method.

[mattjohnsonpint]

It would be useful if the entire exception object was available somewhere, so that it could be retrieved in a processor. Reducing an exception to its type, message, and stacktrace string makes it impossible to recreate the exception or get at values from other properties. For example ArgumentOutOfRangeException has an ActualValue property. Such values wouldn’t be available from the Data dictionary.

Additionally, the stack trace string captured in exception.stacktrace is insufficient to create an actual System.Diagnostics.StackTrace instance, if one wants to do anything more advanced with the frames, their IL offsets, etc. One needs the original exception - as in new StackTrace(ex).

[cijothomas]

What would have to happen for the OpenTelemetry specification to change?

Need to open an issue in the opentelemetry-specification repo describing the issue and the suggested improvement.