Expose formatter route traces

formatter_route_trace.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+import json
+from typing import Any
+
+
+def route_trace_json(**values: Any) -> str:
+    trace: dict[str, Any] = {}
+    for key, value in values.items():
+        if value is None:
+            continue
+        if isinstance(value, str):
+            value = value.strip()
+            if not value:
+                continue
+        trace[key] = value
+    return json.dumps(trace, ensure_ascii=True, sort_keys=True)