Hello TAG!

I'm requesting a TAG review of Trace Context Level 2 which is in FPWD.

What: The main difference from Trace Context Level 1 (which is already in recommendation status) is the ability to express whether at least a part of the traceID has been randomly (or pseudo-randomly) generated. Why: This enables downstream systems to use the trace ID for sampling purposes or for sharding purposes. How: This is achieved by the introduction of a new flag called "Random Trace ID flag". If the newly introduced random-trace-id flag is set, at least the right-most 7 bytes of the trace-id MUST be randomly (or pseudo-randomly) generated.

• Explainer¹ (minimally containing user needs and example code): [url]
• Specification URL: https://services.w3.org/htmldiff?doc1=https%3A%2F%2Fwww.w3.org%2FTR%2Ftrace-context-1%2F&doc2=https%3A%2F%2Fwww.w3.org%2FTR%2F2022%2FWD-trace-context-2-20220929%2F
• Tests: https://github.com/w3c/trace-context/tree/main/test, WIP for random-id flag.
• User research:
• Security and Privacy self-review²: https://github.com/w3c/trace-context/issues/496
• GitHub repo (if you prefer feedback filed there): https://github.com/w3c/trace-context/
• Primary contacts (and their relationship to the specification):
  • Sergey Kanzhelev, [Google], co-chair/editor]
  • Daniel Dyla, [Dynatrace], Editor]
  • J. Kalyana Sundaram, [Microsoft], co-chair]
• Organization(s)/project(s) driving the specification: Multiple companies
• Key pieces of existing multi-stakeholder review or discussion of this specification:
• External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://github.com/w3c/trace-context/issues

Further details:

• I have reviewed the TAG's Web Platform Design Principles
• Relevant time constraints or deadlines: We want to get to CR before end of year
• The group where the work on this specification is currently being done: Distributed Tracing Working Group
• The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): Distributed Tracing Working Group
• Major unresolved issues with or opposition to this specification: None
• This work is being funded by: Multiple companies

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