feat!: move tracing to rely on ctx

[giortzisg]

Description

Modify existing tracing and propagation behavior to rely on context.Context. Tracing now resolves state from context rather than hubs. This includes a breaking change on ContinueTrace removing the need for a hub to be passed.

#skip-changelog

Issues

• resolves: Refactor scope propagation to rely on context.Context #1367
• resolves: GO-154

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Reminders

• Add GH Issue ID & Linear ID
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[linear-code]

GO-154

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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Forked scope keeps unrelated span

Medium Severity

WithScope replaces the cloned propagation context when continuedTrace is false, but it keeps the parent's span. A forked scope then mixes a new trace ID with the previous transaction: hub propagation still follows the old span, while spanless telemetry uses the new propagation context.

 

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Shared roots record wrong sample rate

Medium Severity

keepSamplingDecision returns before storing sample_rate unless the scope DSC is already frozen and populated. Later root spans on that scope inherit only the boolean decision, and sample rewrites sampleRate to 1 or 0. Their dynamic sampling context no longer matches the rate that actually sampled the trace.

Additional Locations (1)

• tracing.go#L645-L656

 

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