Report usage for beam search (#6404)

vllm/sampling_params.py

@@ -189,6 +189,10 @@ class SamplingParams:
 
         self._verify_args()
         if self.use_beam_search:
+            # Lazy import to avoid circular imports.
+            from vllm.usage.usage_lib import set_runtime_usage_data
+            set_runtime_usage_data("use_beam_search", True)
+
             if not envs.VLLM_NO_DEPRECATION_WARNING:
                 logger.warning(
                     "[IMPORTANT] We plan to discontinue the support for beam "
@@ -196,6 +200,7 @@ class SamplingParams:
                     "https://github.com/vllm-project/vllm/issues/6226 for "
                     "more information. Set VLLM_NO_DEPRECATION_WARNING=1 to "
                     "suppress this warning.")
+
             self._verify_beam_search()
         else:
             self._verify_non_beam_search()