PoC Trace Attachments #18474
Description
The SDK should send new trace attachments by adapting the scope.addAttachment API (docs here) to send the new trace attachment envelope.
For now, we'll only experiment with this locally, and perhaps release it in a preview version.
Goals:
- define the new envelope type
- change attachment sending behavior to send an attachment in its standalone envelope once
Scope::addAttachment()is called. - test if attachments are ingested and show in the product correctly
- Once initial tests concluded, talk to Telemetry Experience team regarding attachment<>span association (Span Attachments).
Out of Scope:
- merging the PoC into our stable SDK code base (we'll do this in the next major)
- span attachments implementation
Once we go stable (out of scope for this ticket), there should be no user-facing API breaking changes. This is still a breaking change, since the new envelope will require a higher self-hosted version.