diff --git a/python/sglang/srt/managers/scheduler.py b/python/sglang/srt/managers/scheduler.py
index 486dbe996..15e1ff6d9 100644
--- a/python/sglang/srt/managers/scheduler.py
+++ b/python/sglang/srt/managers/scheduler.py
@@ -3031,6 +3031,37 @@ class Scheduler(
             if_success = False
         return ClearHiCacheReqOutput(success=if_success)
 
+    def on_idle(self):
+        """Idle housekeeping: guard, check, metrics, reset, sleep."""
+        if not self.is_fully_idle():
+            return
+
+        # memory leak check (skipped for hisparse — pool counters intentionally
+        # diverge during host-backup, see _get_swa_token_info clamp).
+        if not self.enable_hisparse:
+            has_leak, messages = self._check_all_pools(self.get_pool_stats())
+            if has_leak:
+                self._report_leak("pool", "\n".join(messages))
+            self._check_req_pool()
+
+        # tree cache sanity check
+        self._check_tree_cache()
+
+        # metrics every 30s
+        self._maybe_log_idle_metrics()
+
+        # kv event publishing
+        self._publish_kv_events()
+
+        # reset token ratio
+        self.new_token_ratio = self.init_new_token_ratio
+
+        # reset device timer window so idle time isn't counted
+        self.reset_device_timer_window()
+
+        # sleep until next event
+        self.maybe_sleep_on_idle()
+
     def is_fully_idle(self, for_health_check=False) -> bool:
         # Health check piggybacks on running requests in process_output.
         # Only running_batch + waiting_queue guarantee active GPU processing;
diff --git a/python/sglang/srt/managers/scheduler_runtime_checker_mixin.py b/python/sglang/srt/managers/scheduler_runtime_checker_mixin.py
index 9b5f7709c..9d81c6e3a 100644
--- a/python/sglang/srt/managers/scheduler_runtime_checker_mixin.py
+++ b/python/sglang/srt/managers/scheduler_runtime_checker_mixin.py
@@ -548,37 +548,6 @@ class SchedulerRuntimeCheckerMixin:
         ):
             self.tree_cache.sanity_check()
 
-    def on_idle(self: Scheduler):
-        """Idle housekeeping: guard, check, metrics, reset, sleep."""
-        if not self.is_fully_idle():
-            return
-
-        # memory leak check (skipped for hisparse — pool counters intentionally
-        # diverge during host-backup, see _get_swa_token_info clamp).
-        if not self.enable_hisparse:
-            has_leak, messages = self._check_all_pools(self.get_pool_stats())
-            if has_leak:
-                self._report_leak("pool", "\n".join(messages))
-            self._check_req_pool()
-
-        # tree cache sanity check
-        self._check_tree_cache()
-
-        # metrics every 30s
-        self._maybe_log_idle_metrics()
-
-        # kv event publishing
-        self._publish_kv_events()
-
-        # reset token ratio
-        self.new_token_ratio = self.init_new_token_ratio
-
-        # reset device timer window so idle time isn't counted
-        self.reset_device_timer_window()
-
-        # sleep until next event
-        self.maybe_sleep_on_idle()
-
 
 def create_scheduler_watchdog(
     scheduler: Scheduler, watchdog_timeout: float, soft: bool = False