diff --git a/src/main/java/gc/mda/signal_batch/domain/gis/controller/GisControllerV2.java b/src/main/java/gc/mda/signal_batch/domain/gis/controller/GisControllerV2.java
index 495171a..a3476da 100644
--- a/src/main/java/gc/mda/signal_batch/domain/gis/controller/GisControllerV2.java
+++ b/src/main/java/gc/mda/signal_batch/domain/gis/controller/GisControllerV2.java
@@ -191,7 +191,11 @@ public class GisControllerV2 {
             )
             @RequestBody VesselTracksRequest request,
             HttpServletRequest httpRequest) {
-        return gisServiceV2.getVesselTracksV2(request, getClientIp(httpRequest));
+        return gisServiceV2.getVesselTracksV2(request, getClientIp(httpRequest), getClientId(httpRequest));
+    }
+
+    private String getClientId(HttpServletRequest request) {
+        return gc.mda.signal_batch.global.config.WebSocketStompConfig.extractClientIdFromRequest(request);
     }
 
     private String getClientIp(HttpServletRequest request) {
diff --git a/src/main/java/gc/mda/signal_batch/domain/gis/service/GisServiceV2.java b/src/main/java/gc/mda/signal_batch/domain/gis/service/GisServiceV2.java
index 42ec069..b3d6478 100644
--- a/src/main/java/gc/mda/signal_batch/domain/gis/service/GisServiceV2.java
+++ b/src/main/java/gc/mda/signal_batch/domain/gis/service/GisServiceV2.java
@@ -285,7 +285,7 @@ public class GisServiceV2 {
     /**
      * 선박별 항적 조회 V2 (캐시 + Semaphore + 간소화 + ChnPrmShip enrichment)
      */
-    public List<CompactVesselTrack> getVesselTracksV2(VesselTracksRequest request, String clientIp) {
+    public List<CompactVesselTrack> getVesselTracksV2(VesselTracksRequest request, String clientIp, String clientId) {
         String queryId = "rest-vessels-" + UUID.randomUUID().toString().substring(0, 8);
         long startMs = System.currentTimeMillis();
         boolean slotAcquired = false;
@@ -329,7 +329,7 @@ public class GisServiceV2 {
                     result.size(), request.getVessels().size(),
                     dailyTrackCacheManager.isEnabled(), request.isIncludeChnPrmShip());
 
-            enqueueRestMetric(queryId, request, result, startMs, clientIp);
+            enqueueRestMetric(queryId, request, result, startMs, clientIp, clientId);
 
             return result;
 
@@ -347,7 +347,7 @@ public class GisServiceV2 {
     }
 
     private void enqueueRestMetric(String queryId, VesselTracksRequest request,
-                                   List<CompactVesselTrack> result, long startMs, String clientIp) {
+                                   List<CompactVesselTrack> result, long startMs, String clientIp, String clientId) {
         try {
             int totalPoints = result.stream().mapToInt(CompactVesselTrack::getPointCount).sum();
             long responseBytes = (long) result.size() * 200 + (long) totalPoints * 40;
@@ -367,6 +367,7 @@ public class GisServiceV2 {
                     .elapsedMs(System.currentTimeMillis() - startMs)
                     .status("COMPLETED")
                     .clientIp(clientIp)
+                    .clientId(clientId)
                     .build());
         } catch (Exception e) {
             log.debug("Failed to enqueue REST metric: {}", e.getMessage());
diff --git a/src/main/java/gc/mda/signal_batch/global/config/WebSocketStompConfig.java b/src/main/java/gc/mda/signal_batch/global/config/WebSocketStompConfig.java
index e8f0c46..419c913 100644
--- a/src/main/java/gc/mda/signal_batch/global/config/WebSocketStompConfig.java
+++ b/src/main/java/gc/mda/signal_batch/global/config/WebSocketStompConfig.java
@@ -235,42 +235,44 @@ public class WebSocketStompConfig implements WebSocketMessageBrokerConfigurer {
             return "unknown";
         }
 
-        /**
-         * GC_SESSION 쿠키에서 JWT payload의 email 클레임 추출.
-         * JWT 검증은 nginx auth_request에서 이미 완료 — 여기서는 payload 디코딩만 수행.
-         */
         private String extractEmailFromJwtCookie(HttpServletRequest request) {
-            Cookie[] cookies = request.getCookies();
-            if (cookies == null) return null;
+            return extractClientIdFromRequest(request);
+        }
+    }
 
-            String token = null;
-            for (Cookie cookie : cookies) {
-                if ("GC_SESSION".equals(cookie.getName())) {
-                    token = cookie.getValue();
-                    break;
-                }
+    /**
+     * GC_SESSION 쿠키에서 JWT payload의 email 클레임 추출 (REST/WebSocket 공용).
+     * JWT 검증은 nginx auth_request에서 이미 완료 — 여기서는 payload 디코딩만 수행.
+     */
+    public static String extractClientIdFromRequest(HttpServletRequest request) {
+        Cookie[] cookies = request.getCookies();
+        if (cookies == null) return null;
+
+        String token = null;
+        for (Cookie cookie : cookies) {
+            if ("GC_SESSION".equals(cookie.getName())) {
+                token = cookie.getValue();
+                break;
             }
-            if (token == null || token.isEmpty()) return null;
+        }
+        if (token == null || token.isEmpty()) return null;
 
-            try {
-                // JWT: header.payload.signature — payload만 Base64URL 디코딩
-                String[] parts = token.split("\\.");
-                if (parts.length < 2) return null;
+        try {
+            String[] parts = token.split("\\.");
+            if (parts.length < 2) return null;
 
-                String payload = new String(Base64.getUrlDecoder().decode(parts[1]));
-                // 간단한 JSON 파싱 (Jackson 의존 없이): "email":"value" 추출
-                int emailIdx = payload.indexOf("\"email\"");
-                if (emailIdx < 0) return null;
+            String payload = new String(Base64.getUrlDecoder().decode(parts[1]));
+            int emailIdx = payload.indexOf("\"email\"");
+            if (emailIdx < 0) return null;
 
-                int colonIdx = payload.indexOf(':', emailIdx);
-                int quoteStart = payload.indexOf('"', colonIdx + 1);
-                int quoteEnd = payload.indexOf('"', quoteStart + 1);
-                if (quoteStart < 0 || quoteEnd < 0) return null;
+            int colonIdx = payload.indexOf(':', emailIdx);
+            int quoteStart = payload.indexOf('"', colonIdx + 1);
+            int quoteEnd = payload.indexOf('"', quoteStart + 1);
+            if (quoteStart < 0 || quoteEnd < 0) return null;
 
-                return payload.substring(quoteStart + 1, quoteEnd);
-            } catch (Exception e) {
-                return null;
-            }
+            return payload.substring(quoteStart + 1, quoteEnd);
+        } catch (Exception e) {
+            return null;
         }
     }
 }
\ No newline at end of file