user.segment isn't unified.
iOS reads from user.data and Java from user.other.
#37 but the right behavior is adding a top-level property called segment.
https://github.com/getsentry/sentry-javascript/blob/beb3c973c0f10c538c8369983fc08c5bd031bfde/packages/types/src/user.ts#L8
Java issue

• User segment should be a top level property on the user sentry-java#2240
  iOS issue
• User segment should be a top level property on the user sentry-cocoa#2149
  Docs PR
• Add user segment to user payload docs develop#685

tracePropagationTargets isn't unified, but we'd need to offer at least one option.
Java reads from tracingOrigins and iOS does not have it at all.
#39

baggage behavior isn't unified.
Java always overwrites the baggage header which is wrong per spec, iOS does not.
https://develop.sentry.dev/sdk/performance/dynamic-sampling-context/#baggage
Java has an open draft that addresses that.

• Implementation for server-side baggage support and third party header handling sentry-java#2226

traceSampling SDK option.
Java is guarded by this option, iOS does not have it at all, not sure if such a flag should exist.
Apparently, it's only gated by tracePropagationTargets, we don't need such traceSampling flag.
Java issue

• Deprecate/remove traceSampling flag in favor of tracePropagationTargets sentry-java#2244
  iOS will do
• Support tracePropagationTargets #39

SDK's don't implement the dynamic_sampling_context_frozen logic, do we need it?
https://develop.sentry.dev/sdk/performance/dynamic-sampling-context/#unified-propagation-mechanism
https://develop.sentry.dev/sdk/performance/dynamic-sampling-context/#freezing-dynamic-sampling-context
Java has an open draft that addresses that.
This is experimental and we should not do anything for now, even less relevant for Mobile.

How do we track the adoption of DS on SDKs? do we need to?

Remove isTraceSampling option so we can propagate baggage by default

• iOS
• Android
• Flutter
• .NET
• React Native

Related issues

• Dynamic Sampling support sentry-dotnet#1840