### Description Reverting `sampling_context` to look like it used to in transaction-based tracing. Caveat: There's a bunch of keys that are not populated in span streaming, mostly because they're not known at span start (`span_id`, `sampled`, etc.). I've kept them in as `None` as that's how the legacy path did it, too (rather than omitting them). Note: When bumping the sdk version in sentry and seer to a version that has this change, the sampling_context code needs to change there, too. #### Issues resolves getsentry#6846 #### Reminders - Please add tests to validate your changes, and lint your code using `uv run ruff`. - Add GH Issue ID _&_ Linear ID (if applicable) - PR title should use [conventional commit](https://develop.sentry.dev/engineering-practices/commit-messages/#type) style (`feat:`, `fix:`, `ref:`, `meta:`) - For external contributors: [CONTRIBUTING.md](https://github.com/getsentry/sentry-python/blob/master/CONTRIBUTING.md), [Sentry SDK development docs](https://develop.sentry.dev/sdk/), [Discord community](https://discord.gg/Ww9hbqr)

Revert sampling context to legacy format in streaming #6846

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linear-code commented on Jul 20, 2026

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