diff --git a/python/sglang/srt/observability/scheduler_metrics_mixin.py b/python/sglang/srt/observability/scheduler_metrics_mixin.py
index b161d9b51..392c5ca51 100644
--- a/python/sglang/srt/observability/scheduler_metrics_mixin.py
+++ b/python/sglang/srt/observability/scheduler_metrics_mixin.py
@@ -116,9 +116,16 @@ class SchedulerMetricsMixin:
 
         # Metrics
         self.enable_metrics = self.server_args.enable_metrics
-        self.is_stats_logging_rank = self.attn_tp_rank == 0
+        # Under CP, attn_cp_size shards the TP group so attn_tp_size collapses to 1 and
+        # attn_tp_rank == 0 on EVERY CP rank. Gate on (attn_tp_rank == 0 AND attn_cp_rank == 0)
+        # -- matching the scheduler's other single-rank guards -- so exactly one rank logs /
+        # emits scheduler-side metrics; otherwise all attn_cp_size ranks would each report,
+        # inflating summed token-throughput / SchedulerStats by cp_size. No-op when CP is off
+        # (attn_cp_rank is always 0 there).
+        self.is_stats_logging_rank = self.attn_tp_rank == 0 and self.attn_cp_rank == 0
         self.current_scheduler_metrics_enabled = self.enable_metrics and (
-            self.attn_tp_rank == 0 or self.server_args.enable_metrics_for_all_schedulers
+            (self.attn_tp_rank == 0 and self.attn_cp_rank == 0)
+            or self.server_args.enable_metrics_for_all_schedulers
         )
         if self.enable_metrics:
             if self.server_args.disaggregation_mode == DisaggregationMode.PREFILL.value: