Tiny add logging for GC (#7406)

python/sglang/srt/managers/scheduler.py

@@ -140,6 +140,7 @@ from sglang.srt.utils import (
     DeepEPMode,
     DynamicGradMode,
     broadcast_pyobj,
+    configure_gc_logger,
     configure_logger,
     disable_request_logging,
     get_available_gpu_memory,
@@ -508,6 +509,9 @@ class Scheduler(
         )
         self.init_disaggregation()
 
+        if get_bool_env_var("SGLANG_GC_LOG"):
+            configure_gc_logger()
+
     def maybe_sleep_on_idle(self):
         if self.idle_sleeper is not None:
             self.idle_sleeper.maybe_sleep()