Traceparent
W3C trace context that links this request to a distributed trace.
Request and response header tracing
How it works
Lets you follow one request across services in observability tools.
Example
traceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01
See it live: send any request in Endpoint Client and open the Headers tab, where every response header is explained. Specification: W3C Trace Context.