tracing/datadog: fix sampling priority escalation on route cache refresh#43533
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bvandewalle wants to merge 1 commit intoenvoyproxy:mainfrom
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tracing/datadog: fix sampling priority escalation on route cache refresh#43533bvandewalle wants to merge 1 commit intoenvoyproxy:mainfrom
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Signed-off-by: Bernard Van De Walle <bernard@bvandewa.com>
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Commit Message: Fix inconsistent behavior between DD tracer on startSpan and setSampled.
Additional Description: Fixed the Datadog tracer's
setSampled(true)to not override the sampling priority, matching thestartSpan()behavior of leaving the priority unset so the Datadog agent can apply its own sampling rate. Previously,setSampled(true)would setUSER_KEEPpriority which prevented the agent from downsampling, causing a significant increase in trace volume when combined with route cache refreshes in Envoy 1.36.Risk Level: Low
Testing: None
Docs Changes: N/A
Release Notes: Added
Fix #43532