Add logging when sandbox is assigned to conversation (#13143)

Co-authored-by: openhands <openhands@all-hands.dev>

openhands/app_server/app_conversation/live_status_app_conversation_service.py

@@ -518,6 +518,17 @@ class LiveStatusAppConversationService(AppConversationServiceBase):
         # Update the listener with sandbox info
         task.status = AppConversationStartTaskStatus.WAITING_FOR_SANDBOX
         task.sandbox_id = sandbox.id
+
+        # Log sandbox assignment for observability
+        conversation_id_str = (
+            str(task.request.conversation_id)
+            if task.request.conversation_id is not None
+            else 'unknown'
+        )
+        _logger.info(
+            f'Assigned sandbox {sandbox.id} to conversation {conversation_id_str}'
+        )
+
         yield task
 
         # Resume if paused

openhands/app_server/sandbox/remote_sandbox_service.py

@@ -515,6 +515,10 @@ class RemoteSandboxService(SandboxService):
             # Hack - result doesn't contain this
             runtime_data['pod_status'] = 'pending'
 
+            # Log runtime assignment for observability
+            runtime_id = runtime_data.get('runtime_id', 'unknown')
+            _logger.info(f'Started sandbox {sandbox_id} with runtime_id={runtime_id}')
+
             return self._to_sandbox_info(stored_sandbox, runtime_data)
 
         except httpx.HTTPError as e: