[None][fix] Serialize the window_size in the kv event (NVIDIA#6526)

Signed-off-by: richardhuo-nv <[email protected]>

Author: richardhuo-nv

tensorrt_llm/_utils.py

@@ -991,6 +991,7 @@ def to_json_str(cls, event):
         return {
             "event_id": event.event_id,
             "data": event_serialize_func(event.data),
+            "window_size": event.window_size
         }
 
     @staticmethod

tests/unittest/llmapi/test_llm_kv_cache_events.py

@@ -75,7 +75,8 @@ def test_kv_cache_event_data_serialization():
     flush_events(kv_cache_manager)
     events = kv_cache_manager.get_latest_events(10)
     serialized_event = KVCacheEventSerializer.serialize(events)
-    assert len(serialized_event) == 1 and serialized_event[0]["event_id"] == 0
+    assert len(serialized_event) == 1 and serialized_event[0][
+        "event_id"] == 0 and serialized_event[0]["window_size"] == 256
     assert serialized_event[0]["data"]["type"] == "created"
     assert len(serialized_event[0]["data"]["num_blocks_per_cache_level"]) == 2