Tag
trace-context
- Jun 17, 2026 The traceparent Header: Field Widths and Version Negotiation The exact byte layout of the W3C traceparent header, why its fields are fixed width, what the flags byte means, and how a version-00 parser must treat unknown versions. observability
- May 27, 2026 Head-Based Sampling: Where the Decision Belongs and What It Costs How probabilistic and rate-limiting samplers make the keep-or-drop call at trace start, why the decision must be consistent across the trace, and how the sampled flag makes it authoritative downstream. observability
- Sep 11, 2024 The baggage Header: Limits, Trust Boundaries, and Misuse How W3C Baggage carries arbitrary key-value pairs alongside a trace, the member and byte limits that force dropping, and why every entry crossing a trust boundary is untrusted input. observability
- Nov 22, 2021 Span Anatomy: Trace IDs, Span IDs, and Parent Links How a trace is assembled from spans, why two identifiers with different scopes are needed, and what a span record must carry for the tree to be reconstructible offline. observability