fix metadata bug

Author: yaozheng-fang

veadk/agent.py

@@ -227,9 +227,15 @@ def model_post_init(self, __context: Any) -> None:
         if self.long_term_memory is not None:
             from google.adk.tools import load_memory
 
-            if not load_memory.custom_metadata:
-                load_memory.custom_metadata = {}
-            load_memory.custom_metadata["backend"] = self.long_term_memory.backend
+            if hasattr(load_memory, "custom_metadata"):
+                if not load_memory.custom_metadata:
+                    load_memory.custom_metadata = {}
+                load_memory.custom_metadata["backend"] = self.long_term_memory.backend
+            else:
+                logger.warning(
+                    "load_memory tool does not have custom_metadata attribute, you can update your Google-ADK version, "
+                    "long_term_memory backend information will not be set."
+                )
             self.tools.append(load_memory)
 
         logger.info(f"VeADK version: {VERSION}")

veadk/tracing/telemetry/exporters/apmplus_exporter.py

@@ -402,7 +402,7 @@ def record_tool_call(
         operation_type = "tool"
         operation_name = tool.name
         operation_backend = ""
-        if tool.custom_metadata:
+        if hasattr(tool, "custom_metadata") and tool.custom_metadata:
             operation_backend = tool.custom_metadata.get("backend", "")
 
         attributes = {