docs: add release-note fragment for PR #1667 (#1685)

llm-d-router-release-notes[bot] · web-flow · commit f61ab917d99f · 2026-06-22T09:42:40.000+03:00
Signed-off-by: llm-d-router-release-notes[bot] &lt;287676111+llm-d-router-release-notes[bot]@users.noreply.github.com&gt;
Co-authored-by: llm-d-router-release-notes[bot] &lt;287676111+llm-d-router-release-notes[bot]@users.noreply.github.com&gt;
diff --git a/release-notes.d/unreleased/1667.md b/release-notes.d/unreleased/1667.md
@@ -0,0 +1,7 @@
+---
+pr: 1667
+url: https://github.com/llm-d/llm-d-router/pull/1667
+author: gyliu513
+date: 2026-06-18
+---
+Fix P/D sidecar trace propagation so prefill, decode, and encoder requests inject W3C trace context, keeping EPP, routing-proxy, and vLLM spans in a single trace
