[V1][Metrics] add support for kv event publishing (#16750)

Signed-off-by: alec-flowers <aflowers@nvidia.com>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Co-authored-by: Mark McLoughlin <markmc@redhat.com>

vllm/v1/engine/core.py

@@ -259,6 +259,8 @@ class EngineCore:
         self.structured_output_manager.clear_backend()
         if self.model_executor:
             self.model_executor.shutdown()
+        if self.scheduler:
+            self.scheduler.shutdown()
 
     def profile(self, is_start: bool = True):
         self.model_executor.profile(is_start)