[llm] Add app name for OpenRouter (#4010)

openhands/core/config/llm_config.py

@@ -50,6 +50,8 @@ class LLMConfig:
     aws_access_key_id: str | None = None
     aws_secret_access_key: str | None = None
     aws_region_name: str | None = None
+    openrouter_site_url: str = 'https://docs.all-hands.dev/'
+    openrouter_app_name: str = 'OpenHands'
     num_retries: int = 8
     retry_multiplier: float = 2
     retry_min_wait: int = 15

openhands/llm/llm.py

@@ -1,5 +1,6 @@
 import asyncio
 import copy
+import os
 import time
 import warnings
 from functools import partial
@@ -75,6 +76,9 @@ class LLM:
         self.cost_metric_supported = True
         self.config = copy.deepcopy(config)
 
+        os.environ['OR_SITE_URL'] = self.config.openrouter_site_url
+        os.environ['OR_APP_NAME'] = self.config.openrouter_app_name
+
         # list of LLM completions (for logging purposes). Each completion is a dict with the following keys:
         # - 'messages': list of messages
         # - 'response': response from the LLM