feat(telemetry): use zero-width space to avoid clutter (#1754)

# What does this PR do?
Before 
<img width="858" alt="image"
src="https://github.com/user-attachments/assets/6cefb1ae-5603-4818-85ea-a0c337b986bc"
/>

Note the redundant 'llama-stack' in front of every span

## Test Plan
<img width="1171" alt="image"
src="https://github.com/user-attachments/assets/bdc5fd5b-ff1f-4f10-8b40-cff2ea93dd1f"
/>

llama_stack/distribution/library_client.py

@@ -254,7 +254,7 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
                 func = getattr(impl, endpoint.name)
                 if endpoint.method not in endpoint_impls:
                     endpoint_impls[endpoint.method] = {}
-                endpoint_impls[endpoint.method][_convert_path_to_regex(endpoint.route)] = func
+                endpoint_impls[endpoint.method][_convert_path_to_regex(endpoint.route)] = (func, endpoint.route)
 
         self.endpoint_impls = endpoint_impls
         return True
@@ -290,7 +290,7 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
                 )
             return response
 
-    def _find_matching_endpoint(self, method: str, path: str) -> tuple[Any, dict]:
+    def _find_matching_endpoint(self, method: str, path: str) -> tuple[Any, dict, str]:
         """Find the matching endpoint implementation for a given method and path.
 
         Args:
@@ -307,12 +307,12 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
         if not impls:
             raise ValueError(f"No endpoint found for {path}")
 
-        for regex, func in impls.items():
+        for regex, (func, route) in impls.items():
             match = re.match(regex, path)
             if match:
                 # Extract named groups from the regex match
                 path_params = match.groupdict()
-                return func, path_params
+                return func, path_params, route
 
         raise ValueError(f"No endpoint found for {path}")
 
@@ -326,10 +326,10 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
         body = options.params or {}
         body |= options.json_data or {}
 
-        matched_func, path_params = self._find_matching_endpoint(options.method, path)
+        matched_func, path_params, route = self._find_matching_endpoint(options.method, path)
         body |= path_params
         body = self._convert_body(path, options.method, body)
-        await start_trace(options.url, {"__location__": "library_client"})
+        await start_trace(route, {"__location__": "library_client"})
         try:
             result = await matched_func(**body)
         finally:
@@ -371,13 +371,13 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
         path = options.url
         body = options.params or {}
         body |= options.json_data or {}
-        func, path_params = self._find_matching_endpoint(options.method, path)
+        func, path_params, route = self._find_matching_endpoint(options.method, path)
         body |= path_params
 
         body = self._convert_body(path, options.method, body)
 
         async def gen():
-            await start_trace(options.url, {"__location__": "library_client"})
+            await start_trace(route, {"__location__": "library_client"})
             try:
                 async for chunk in await func(**body):
                     data = json.dumps(convert_pydantic_to_json_value(chunk))
@@ -422,7 +422,7 @@ class AsyncLlamaStackAsLibraryClient(AsyncLlamaStackClient):
         if not body:
             return {}
 
-        func, _ = self._find_matching_endpoint(method, path)
+        func, _, _ = self._find_matching_endpoint(method, path)
         sig = inspect.signature(func)
 
         # Strip NOT_GIVENs to use the defaults in signature

llama_stack/providers/inline/telemetry/meta_reference/config.py

@@ -29,7 +29,8 @@ class TelemetryConfig(BaseModel):
         description="The OpenTelemetry collector endpoint URL for metrics",
     )
     service_name: str = Field(
-        default="llama-stack",
+        # service name is always the same, use zero-width space to avoid clutter
+        default="​",
         description="The service name to use for telemetry",
     )
     sinks: List[TelemetrySink] = Field(
@@ -51,7 +52,7 @@ class TelemetryConfig(BaseModel):
     @classmethod
     def sample_run_config(cls, __distro_dir__: str, db_name: str = "trace_store.db") -> Dict[str, Any]:
         return {
-            "service_name": "${env.OTEL_SERVICE_NAME:llama-stack}",
+            "service_name": "${env.OTEL_SERVICE_NAME:​}",
             "sinks": "${env.TELEMETRY_SINKS:console,sqlite}",
             "sqlite_db_path": "${env.SQLITE_DB_PATH:" + __distro_dir__ + "/" + db_name + "}",
         }

llama_stack/templates/bedrock/run.yaml

@@ -39,7 +39,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/bedrock/trace_store.db}
   eval:

llama_stack/templates/cerebras/run.yaml

@@ -79,7 +79,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/cerebras/trace_store.db}
   tool_runtime:

llama_stack/templates/ci-tests/run.yaml

@@ -42,7 +42,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/ci-tests/trace_store.db}
   eval:

llama_stack/templates/dell/run-with-safety.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/dell/trace_store.db}
   eval:

llama_stack/templates/dell/run.yaml

@@ -41,7 +41,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/dell/trace_store.db}
   eval:

llama_stack/templates/dev/run.yaml

@@ -71,7 +71,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/dev/trace_store.db}
   eval:

llama_stack/templates/fireworks/run-with-safety.yaml

@@ -50,7 +50,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/fireworks/trace_store.db}
   eval:

llama_stack/templates/fireworks/run.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/fireworks/trace_store.db}
   eval:

llama_stack/templates/groq/run.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/groq/trace_store.db}
   eval:

llama_stack/templates/hf-endpoint/run-with-safety.yaml

@@ -50,7 +50,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/hf-endpoint/trace_store.db}
   eval:

llama_stack/templates/hf-endpoint/run.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/hf-endpoint/trace_store.db}
   eval:

llama_stack/templates/hf-serverless/run-with-safety.yaml

@@ -50,7 +50,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/hf-serverless/trace_store.db}
   eval:

llama_stack/templates/hf-serverless/run.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/hf-serverless/trace_store.db}
   eval:

llama_stack/templates/meta-reference-gpu/run-with-safety.yaml

@@ -52,7 +52,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/meta-reference-gpu/trace_store.db}
   eval:

llama_stack/templates/meta-reference-gpu/run.yaml

@@ -46,7 +46,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/meta-reference-gpu/trace_store.db}
   eval:

llama_stack/templates/meta-reference-quantized-gpu/run.yaml

@@ -48,7 +48,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/meta-reference-quantized-gpu/trace_store.db}
   eval:

llama_stack/templates/nvidia/run-with-safety.yaml

@@ -48,7 +48,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/nvidia/trace_store.db}
   eval:

llama_stack/templates/nvidia/run.yaml

@@ -43,7 +43,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/nvidia/trace_store.db}
   eval:

llama_stack/templates/ollama/run-with-safety.yaml

@@ -43,7 +43,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/ollama/trace_store.db}
   eval:

llama_stack/templates/ollama/run.yaml

@@ -41,7 +41,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/ollama/trace_store.db}
   eval:

llama_stack/templates/open-benchmark/run.yaml

@@ -68,7 +68,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/open-benchmark/trace_store.db}
   eval:

llama_stack/templates/passthrough/run-with-safety.yaml

@@ -50,7 +50,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/passthrough/trace_store.db}
   eval:

llama_stack/templates/passthrough/run.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/passthrough/trace_store.db}
   eval:

llama_stack/templates/remote-vllm/run-with-safety.yaml

@@ -88,7 +88,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/remote-vllm/trace_store.db}
   tool_runtime:

llama_stack/templates/remote-vllm/run.yaml

@@ -81,7 +81,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/remote-vllm/trace_store.db}
   tool_runtime:

llama_stack/templates/sambanova/run.yaml

@@ -51,7 +51,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/sambanova/trace_store.db}
   tool_runtime:

llama_stack/templates/tgi/run-with-safety.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/tgi/trace_store.db}
   eval:

llama_stack/templates/tgi/run.yaml

@@ -44,7 +44,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/tgi/trace_store.db}
   eval:

llama_stack/templates/together/run-with-safety.yaml

@@ -50,7 +50,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/together/trace_store.db}
   eval:

llama_stack/templates/together/run.yaml

@@ -45,7 +45,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/together/trace_store.db}
   eval:

llama_stack/templates/vllm-gpu/run.yaml

@@ -49,7 +49,7 @@ providers:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
     config:
-      service_name: ${env.OTEL_SERVICE_NAME:llama-stack}
+      service_name: "${env.OTEL_SERVICE_NAME:\u200B}"
       sinks: ${env.TELEMETRY_SINKS:console,sqlite}
       sqlite_db_path: ${env.SQLITE_DB_PATH:~/.llama/distributions/vllm-gpu/trace_store.db}
   eval: