Fix KV event publisher bind conflict under PP (#29044)

python/sglang/srt/managers/scheduler.py

@@ -454,6 +454,7 @@ class Scheduler(
             enable_metrics=self.server_args.enable_metrics,
             enable_kv_cache_events=bool(
                 self.server_args.kv_events_config
+                and self.ps.pp_rank == 0
                 and self.ps.attn_tp_rank == 0
                 and self.ps.attn_cp_rank == 0
             ),

python/sglang/srt/managers/scheduler_components/kv_events_publisher.py

@@ -59,7 +59,10 @@ class SchedulerKvEventsPublisher:
 
     def init_kv_events(self, kv_events_config: Optional[str]):
         self.enable_kv_cache_events = bool(
-            kv_events_config and self.ps.attn_tp_rank == 0 and self.ps.attn_cp_rank == 0
+            kv_events_config
+            and self.ps.pp_rank == 0
+            and self.ps.attn_tp_rank == 0
+            and self.ps.attn_cp_rank == 0
         )
 
         if self.enable_kv_cache_events:

python/sglang/srt/observability/metrics_collector.py

@@ -1044,6 +1044,7 @@ class SchedulerMetricsCollector(_StatLoggerDIMixin):
         )
         enable_kv_cache_events = bool(
             server_args.kv_events_config
+            and ps.pp_rank == 0
             and ps.attn_tp_rank == 0
             and ps.attn_cp_rank == 0
         )