{"version":"2.1.239","anchor":"trace-context-can-be-picked-up-from-an-incoming-request","canonical_anchor":"trace-context-can-be-picked-up-from-an-incoming-request","heading":"Trace context can be picked up from an incoming request","tier":"internal","area":"Telemetry","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.239\/e\/trace-context-can-be-picked-up-from-an-incoming-request","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.239","markdown":"### Trace context can be picked up from an incoming request\n\nTelemetry spans can now join a trace that was started by whatever called in.\n\n**What**\n\nNew helpers read a W3C `traceparent` header into a telemetry context and run work inside it, so spans can join a trace started elsewhere. They do nothing when telemetry is off or when no header is present, in which case the work runs as before.\n\n**Evidence**\n\n`traceparent`\n\n- Area: Telemetry\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 3\/5"}