The Distributed Tracing Working Group invites implementations of Trace Context Candidate Recommendation. This specification defines standard headers and value format to propagate context information that enables distributed tracing scenarios. The specification standardizes how context information is sent and modified between services. Context information uniquely identifies individual requests in a distributed system and also defines a means to add and propagate provider-specific context information.

Original source: https://www.w3.org/blog/news/archives/7741