diff --git a/src/main/java/com/kamco/cd/training/common/service/SystemMonitorService.java b/src/main/java/com/kamco/cd/training/common/service/SystemMonitorService.java
index 633c7c2..443c05e 100644
--- a/src/main/java/com/kamco/cd/training/common/service/SystemMonitorService.java
+++ b/src/main/java/com/kamco/cd/training/common/service/SystemMonitorService.java
@@ -127,10 +127,15 @@ public class SystemMonitorService {
     long totalDiff = total - prevTotal;
     long idleDiff = idleAll - prevIdle;
 
+    log.info("CPU raw total={}, idle={}", total, idleAll);
+
     // 상태 업데이트
     prevTotal = total;
     prevIdle = idleAll;
 
+    log.info("CPU prev total={}, prev idle={}", prevTotal, prevIdle);
+    log.info("CPU diff totalDiff={}, idleDiff={}", totalDiff, idleDiff);
+
     // CPU 사용률 계산
     return (1.0 - (double) idleDiff / totalDiff) * 100;
   }