Release 5.10.0 - #261
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fisherdarling
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Sep 1, 2026
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Added
span_with_probe!macro (and its#[span_fn]counterpart,end_probe = true) adds a unique USDT probe point to the created span. It is executed when the span is dropped (provided something attached to the probe point.) The probe point is named after the span, so you can choose which span ends to observe. See theprobe!docs for details on how this works internally.