Add metrics for having prefill and decode in different ranks (#15752)

python/sglang/srt/managers/scheduler.py

@@ -716,6 +716,7 @@ class Scheduler(
         self.last_batch: Optional[ScheduleBatch] = None
         self.forward_ct = 0
         self.last_prefill_tokens = 0
+        self.last_prefill_cache_tokens = 0
         self.return_health_check_ct = 0
         self.num_retracted_reqs: int = 0
         self.num_paused_reqs: int = 0
@@ -1830,6 +1831,8 @@ class Scheduler(
         if ret:
             trace_event_batch("schedule", ret.reqs)
 
+        self.log_prefill_stats_late(ret)
+
         return ret
 
     def get_num_allocatable_reqs(self, running_bs):