fix: apply tracing to routing table properly and MRO

the routing table hierarchy needs to properly recieve trace_protocol. since we are not applying tracing a little later in the process, this needs some special handling

Signed-off-by: Charlie Doern <cdoern@redhat.com>

src/llama_stack/core/routers/__init__.py

@@ -45,6 +45,16 @@ async def get_routing_table_impl(
         raise ValueError(f"API {api.value} not found in router map")
 
     impl = api_to_tables[api.value](impls_by_provider_id, dist_registry, policy)
+
+    # Apply tracing to routing table if any base class has __trace_protocol__ marker
+    # (Tracing will be no-op if telemetry is disabled)
+    traced_classes = [base for base in reversed(impl.__class__.__mro__) if getattr(base, "__trace_protocol__", False)]
+    if traced_classes:
+        from llama_stack.core.telemetry.trace_protocol import trace_protocol
+
+        for cls in traced_classes:
+            trace_protocol(cls)
+
     await impl.initialize()
     return impl
 
@@ -92,12 +102,18 @@ async def get_auto_router_impl(
         api_to_dep_impl["safety_config"] = run_config.safety
 
     impl = api_to_routers[api.value](routing_table, **api_to_dep_impl)
+
+    # Apply tracing to router implementation BEFORE initialize() if telemetry is enabled
+    # Apply to all classes in MRO that have __trace_protocol__ marker to ensure inherited methods are wrapped
+    if run_config.telemetry.enabled:
+        traced_classes = [
+            base for base in reversed(impl.__class__.__mro__) if getattr(base, "__trace_protocol__", False)
+        ]
+        if traced_classes:
+            from llama_stack.core.telemetry.trace_protocol import trace_protocol
+
+            for cls in traced_classes:
+                trace_protocol(cls)
+
     await impl.initialize()
-
-    # Apply tracing to router implementation if telemetry is enabled and protocol wants tracing
-    if run_config.telemetry.enabled and getattr(impl.__class__, "__trace_protocol__", False):
-        from llama_stack.core.telemetry.trace_protocol import trace_protocol
-
-        trace_protocol(impl.__class__)
-
     return impl

src/llama_stack/core/telemetry/trace_protocol.py

@@ -129,6 +129,15 @@ def trace_protocol[T: type[Any]](cls: T) -> T:
         else:
             return sync_wrapper
 
+    # Wrap methods on the class itself (for classes applied at runtime)
+    # Skip if already wrapped (indicated by __wrapped__ attribute)
+    for name, method in vars(cls).items():
+        if inspect.isfunction(method) and not name.startswith("_"):
+            if not hasattr(method, "__wrapped__"):
+                wrapped = trace_method(method)
+                setattr(cls, name, wrapped)  # noqa: B010
+
+    # Also set up __init_subclass__ for future subclasses
     original_init_subclass = cast(Callable[..., Any] | None, getattr(cls, "__init_subclass__", None))
 
     def __init_subclass__(cls_child: type[Any], **kwargs: Any) -> None:  # noqa: N807