fix: kv events with tp > 1 (#10541)

python/sglang/srt/managers/scheduler.py

@@ -259,7 +259,7 @@ class Scheduler(
         self.enable_metrics_for_all_schedulers = (
             server_args.enable_metrics_for_all_schedulers
         )
-        self.enable_kv_cache_events = server_args.kv_events_config is not None
+        self.enable_kv_cache_events = server_args.kv_events_config and tp_rank == 0
         self.stream_interval = server_args.stream_interval
         self.spec_algorithm = SpeculativeAlgorithm.from_string(
             server_args.speculative_algorithm
@@ -553,9 +553,11 @@ class Scheduler(
 
         # Init metrics stats
         self.init_metrics(tp_rank, pp_rank, dp_rank)
-        self.init_kv_events(server_args.kv_events_config)
         self.init_dp_balance(dp_balance_meta)
 
+        if self.enable_kv_cache_events:
+            self.init_kv_events(server_args.kv_events_config)
+
         # Init disaggregation
         self.disaggregation_mode = DisaggregationMode(
             self.server_args.disaggregation_mode