Rename Span.extras to Span.data

[marandaneto]

Context: getsentry/sentry-cocoa#932 (comment)

https://develop.sentry.dev/sdk/event-payloads/span/

if it's a breaking change, fine to do in the next major bump.

[bruno-garcia]

We could add data and set [Obsolete] on extra and remove it on the next major.

[Tyrrrz]

Currently extras are also copied from current scope. Should something like this happen to data? We don't have data on scope.

@bruno-garcia @marandaneto

[marandaneto]

looks like data is missing on Java, not sure if it's been removed or not, see https://github.com/getsentry/sentry-java/blob/bc10b2b70d328241b7c4a5dba32d97ad42d7687c/sentry/src/main/java/io/sentry/SpanContext.java
@maciejwalkowiak knows maybe?

iirc it's not been added because it'd be exposed to the transaction interface which does not have a data field.

@Tyrrrz Span.data != Scope.extras afaik, if they are being copied over, It's a bug probably, not sure.
the way how I see it is either we copy extras from Scope to the data field or we'd need to expose a span.setData(x, y)

extra is part of the Event payload https://develop.sentry.dev/sdk/event-payloads/

[Tyrrrz]

@marandaneto ah, it was a brainfart on my part, the extras are only copied from scope on transactions, not spans. Scratch my question.

[marandaneto]

no worries, the Java issue is getsentry/sentry-java#1233

[Tyrrrz]

Another question:
Since we currently have ITransaction and since ITransaction extends ISpan, what should we do? Adding data to ISpan will make it also appear on ITransaction. Considering we're trying to make this non-breaking by also not removing extra on ISpan, this will result in both extra and data appearing on both ITransaction and ISpan.

I think we should wait with this change for when we drop ITransaction entirely (v4.0?). Otherwise, it will be very confusing in my opinion.

[marandaneto]

@Tyrrrz that's exactly the reason why we've not added to Java, if its the case on .NET too, we can do it once we get rid of ITransaction

[Tyrrrz]

Yep, I think we should wait.