[Log] Warning Once for Cutlass MLA (#23137)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

vllm/v1/attention/backends/mla/cutlass_mla.py

@@ -115,7 +115,7 @@ class CutlassMLAImpl(MLACommonImpl[MLACommonMetadata]):
         self._use_old_cutlass_mla = False
         force_old_cutlass = os.environ.get("FORCE_OLD_CUTLASS_MLA", None)
         if force_old_cutlass:
-            logger.warning("Forcing old cutlass mla kernel")
+            logger.warning_once("Forcing old cutlass mla kernel")
             self._use_old_cutlass_mla = True
 
         # TODO: Currently, num_kv_splits is limited to 16 to avoid hanging
@@ -123,8 +123,8 @@ class CutlassMLAImpl(MLACommonImpl[MLACommonMetadata]):
         #       FORCE_NUM_KV_SPLITS=1
         force_num_kv_splits = os.environ.get("FORCE_NUM_KV_SPLITS", None)
         if force_num_kv_splits:
-            logger.warning("Forcing num_kv_splits to %d",
-                           int(force_num_kv_splits))
+            logger.warning_once("Forcing num_kv_splits to %d",
+                                int(force_num_kv_splits))
             self._num_kv_splits = int(force_num_kv_splits)
         else:
             self._num_kv_splits = -1  # => Auto-detect