diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricAfterDTO.java b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricAfterDTO.java
deleted file mode 100644
index 6ea4219..0000000
--- a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricAfterDTO.java
+++ /dev/null
@@ -1,137 +0,0 @@
-package com.eactive.eai.rms.onl.apim.obp;
-
-import com.eactive.apim.portal.obp.entity.ObpGwMetric;
-import com.google.gson.annotations.SerializedName;
-import lombok.Data;
-
-import java.time.LocalDateTime;
-import java.time.format.DateTimeFormatter;
-
-/**
- * ObpGwMetric JSON 응답 DTO (after-timeslice 엔드포인트용)
- *
- * <p>예시 출력 형식에 맞춤:</p>
- * <pre>
- * {
- *   "apiId": "1ba56b82-a9c9-41e2-b3ab-ff9377667d56",
- *   "apiName": "[해외송금] 가상계좌 입금실패 정보조회",
- *   "apiRoutingUri": "/api/obs/remittance/remittancefail*",
- *   "httpMethod": "POST",
- *   "orgId": "ORG001",
- *   "partnerCode": "000008-01",
- *   "appId": "APP001",
- *   "appKey": "l7xx2fd7efc523794be5a1b126873a5de613",
- *   "requestUri": "-1",
- *   "timeslice": "2025-12-02T03:00:00.000+0000",
- *   "attemptedCount": 3,
- *   "completedCount": 3
- * }
- * </pre>
- */
-@Data
-public class ObpGwMetricAfterDTO {
-
-    private static final DateTimeFormatter ISO8601_MILLIS_FORMATTER =
-            DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'+0000'");
-
-    @SerializedName("apiId")
-    private String apiId;
-
-    @SerializedName("apiName")
-    private String apiName;
-
-    @SerializedName("apiRoutingUri")
-    private String apiRoutingUri;
-
-    @SerializedName("httpMethod")
-    private String httpMethod;
-
-    @SerializedName("orgId")
-    private String orgId;
-
-    @SerializedName("partnerCode")
-    private String partnerCode;
-
-    @SerializedName("appId")
-    private String appId;
-
-    @SerializedName("appKey")
-    private String appKey;
-
-    @SerializedName("requestUri")
-    private String requestUri;
-
-    @SerializedName("timeslice")
-    private String timeslice;
-
-    @SerializedName("attemptedCount")
-    private Long attemptedCount;
-
-    @SerializedName("completedCount")
-    private Long completedCount;
-
-
-    // AS-IS 호환을 위한 필드 (null 값으로 리턴)
-    @SerializedName("clusterHostname")
-    private String clusterHostname = null;
-
-    @SerializedName("apiDatabaseId")
-    private Integer apiDatabaseId = null;
-
-    @SerializedName("unauthorizedCount")
-    private Integer authorizedCount = null;
-
-    @SerializedName("backMinTime")
-    private Integer backMinTime = null;
-
-    @SerializedName("backMaxTime")
-    private Integer backMaxTime = null;
-
-    @SerializedName("backSumTime")
-    private Integer backSumTime = null;
-
-    @SerializedName("frontMinTime")
-    private Integer frontMinTime = null;
-
-    @SerializedName("frontMaxTime")
-    private Integer frontMaxTime = null;
-
-    @SerializedName("frontSumTime")
-    private Integer frontSumTime = null;
-
-
-    /**
-     * Entity → DTO 변환
-     */
-    public static ObpGwMetricAfterDTO from(ObpGwMetric entity) {
-        ObpGwMetricAfterDTO dto = new ObpGwMetricAfterDTO();
-        dto.setApiId(entity.getApiId());
-        dto.setApiName(entity.getApiName());
-        dto.setApiRoutingUri(entity.getUri());
-        dto.setHttpMethod(entity.getMethod());
-        dto.setOrgId(entity.getOrgId());
-        dto.setPartnerCode(entity.getPartnerCode());
-        dto.setAppId(entity.getAppId());
-        dto.setAppKey(entity.getClientId());
-        dto.setRequestUri(entity.getRequestUri());
-        dto.setTimeslice(formatTimeslice(entity.getTimeslice()));
-        dto.setAttemptedCount(entity.getAttemptedCount());
-        dto.setCompletedCount(entity.getCompletedCount());
-
-
-        // 260224 - AS-IS 개발자포탈에서 쓰이던 ID 필드 값 삭제(OBP 디비 필드 형식과 맞지 않음)
-        dto.setOrgId(null);
-        dto.setAppId(null);
-
-        return dto;
-    }
-
-    /**
-     * timeslice를 ISO8601 형식 (밀리초 포함) + UTC 시간대로 변환
-     * 예: 2025-12-02T03:00:00.000+0000
-     */
-    private static String formatTimeslice(LocalDateTime timeslice) {
-        if (timeslice == null) return null;
-        return timeslice.format(ISO8601_MILLIS_FORMATTER);
-    }
-}
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricController.java b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricController.java
index 1e2dbdc..7acd524 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricController.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricController.java
@@ -85,7 +85,7 @@ public class ObpGwMetricController extends BaseRestController {
                     DataSourceTypeManager.getDataSourceType(DataSourceTypeManager.MONITORING));
 
             // 5. 데이터 조회
-            List<ObpGwMetricAfterDTO> metrics = obpGwMetricManService.findByTimesliceAfter(timesliceHour);
+            List<ObpGwMetricDTO> metrics = obpGwMetricManService.findByTimesliceAfter(timesliceHour);
 
             // 6. JSON 변환
             String json = toJson(metrics, pretty);
@@ -104,90 +104,4 @@ public class ObpGwMetricController extends BaseRestController {
             throw new BizException("Failed to retrieve metrics: " + e.getMessage(), e);
         }
     }
-
-    /**
-     * 특정 시간대의 GwMetric 데이터 조회
-     *
-     * @param datetime 조회 시간대 (형식: yyyy-MM-dd_HH:mm:ss)
-     * @param pretty   true면 JSON 들여쓰기 적용
-     * @return JSON Array
-     */
-    @RequestMapping(
-            value = "/kjb/gw-metrics/{datetime}.json",
-            produces = JSON_CONTENT_TYPE
-    )
-    @ResponseBody
-    public String getGwMetrics(
-            @PathVariable("datetime") String datetime,
-            @RequestParam(value = "pretty", required = false) Boolean pretty) {
-        log.debug("GwMetric 조회 요청: datetime={}, pretty={}", datetime, pretty);
-        long startTime = System.currentTimeMillis();
-
-        try {
-            // Path 파라미터 파싱
-            LocalDateTime targetTime = LocalDateTime.parse(datetime, PATH_FORMATTER);
-            LocalDateTime timeslice = targetTime.withMinute(0).withSecond(0).withNano(0);
-
-            // 조회
-            List<ObpGwMetricDTO> metrics = obpGwMetricManService.findByTimeslice(timeslice);
-
-            // JSON 변환 (GSON)
-            String json = toJson(metrics, pretty);
-
-            long elapsed = System.currentTimeMillis() - startTime;
-            log.info("GwMetric 조회 완료: datetime={}, count={}, size={}, elapsed={}ms",
-                    datetime, metrics.size(), getFormattedJsonSize(json), elapsed);
-
-            return json;
-
-        } catch (Exception e) {
-            log.error("GwMetric 조회 실패: datetime={}", datetime, e);
-            throw e;
-        }
-    }
-
-    /**
-     * 특정 시간대 이후의 GwMetric 데이터 조회
-     *
-     * @param datetime 조회 시작 시간대 (형식: yyyy-MM-dd_HH:mm:ss)
-     * @param pretty   true면 JSON 들여쓰기 적용
-     * @return JSON Array (해당 시간대 이후의 모든 지표)
-     * @deprecated Use {@link #getGwMetricsAfterTimesliceV2(String, String, Boolean)} instead.
-     *             Migrate to /api/metrics/afterTimeslice/{timeslice}/{providerCode}
-     *             Will be removed in next major version.
-     */
-    @Deprecated
-    @RequestMapping(
-            value = "/kjb/gw-metrics/after-timeslice/{datetime}.json",
-            produces = JSON_CONTENT_TYPE
-    )
-    @ResponseBody
-    public String getGwMetricsAfterTimeslice(
-            @PathVariable("datetime") String datetime,
-            @RequestParam(value = "pretty", required = false) Boolean pretty) {
-        log.debug("GwMetric after-timeslice 조회 요청: datetime={}, pretty={}", datetime, pretty);
-        long startTime = System.currentTimeMillis();
-
-        try {
-            // Path 파라미터 파싱
-            LocalDateTime targetTime = LocalDateTime.parse(datetime, PATH_FORMATTER);
-            LocalDateTime timeslice = targetTime.withMinute(0).withSecond(0).withNano(0);
-
-            // 조회
-            List<ObpGwMetricAfterDTO> metrics = obpGwMetricManService.findByTimesliceAfter(timeslice);
-
-            // JSON 변환 (GSON)
-            String json = toJson(metrics, pretty);
-
-            long elapsed = System.currentTimeMillis() - startTime;
-            log.info("GwMetric after-timeslice 조회 완료: datetime={}, count={}, size={}, elapsed={}ms",
-                    datetime, metrics.size(), getFormattedJsonSize(json), elapsed);
-
-            return json;
-
-        } catch (Exception e) {
-            log.error("GwMetric after-timeslice 조회 실패: datetime={}", datetime, e);
-            throw e;
-        }
-    }
 }
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricDTO.java b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricDTO.java
index c0d0a0a..976e678 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricDTO.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricDTO.java
@@ -8,32 +8,61 @@ import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 
 /**
- * ObpGwMetric JSON 응답 DTO
- * Entity 주석에 명시된 JSON Key 사용
+ * ObpGwMetric JSON 응답 DTO (after-timeslice 엔드포인트용)
+ *
+ * <p>예시 출력 형식에 맞춤:</p>
+ * <pre>
+ * {
+ *   "apiId": "1ba56b82-a9c9-41e2-b3ab-ff9377667d56",
+ *   "apiName": "[해외송금] 가상계좌 입금실패 정보조회",
+ *   "apiRoutingUri": "/api/obs/remittance/remittancefail*",
+ *   "httpMethod": "POST",
+ *   "orgId": "ORG001",
+ *   "partnerCode": "000008-01",
+ *   "appId": "APP001",
+ *   "appKey": "l7xx2fd7efc523794be5a1b126873a5de613",
+ *   "requestUri": "-1",
+ *   "timeslice": "2025-12-02T03:00:00.000+0000",
+ *   "attemptedCount": 3,
+ *   "completedCount": 3
+ * }
+ * </pre>
  */
 @Data
 public class ObpGwMetricDTO {
 
-    private static final DateTimeFormatter ISO8601_FORMATTER =
-            DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss'+0000'");
+    private static final DateTimeFormatter ISO8601_MILLIS_FORMATTER =
+            DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'+0900'");
 
-    @SerializedName("appKey")
-    private String clientId;
-
-    @SerializedName("clusterHostname")
-    private String hostname;
-
-    @SerializedName("timeslice")
-    private String timeslice;
+    @SerializedName("apiId")
+    private String apiId;
 
     @SerializedName("apiName")
     private String apiName;
 
     @SerializedName("apiRoutingUri")
-    private String uri;
+    private String apiRoutingUri;
 
     @SerializedName("httpMethod")
-    private String method;
+    private String httpMethod;
+
+    @SerializedName("orgId")
+    private String orgId;
+
+    @SerializedName("partnerCode")
+    private String partnerCode;
+
+    @SerializedName("appId")
+    private String appId;
+
+    @SerializedName("appKey")
+    private String appKey;
+
+    @SerializedName("requestUri")
+    private String requestUri;
+
+    @SerializedName("timeslice")
+    private String timeslice;
 
     @SerializedName("attemptedCount")
     private Long attemptedCount;
@@ -41,62 +70,68 @@ public class ObpGwMetricDTO {
     @SerializedName("completedCount")
     private Long completedCount;
 
-    // EAPIM ID
-    @SerializedName("apiIdByEapim")
-    private String apiId;
 
-    @SerializedName("appIdByEapim")
-    private String appId;
+    // AS-IS 호환을 위한 필드 (null 값으로 리턴)
+    @SerializedName("clusterHostname")
+    private String clusterHostname = null;
 
-    @SerializedName("orgIdByEapim")
-    private String orgId;
+    @SerializedName("apiDatabaseId")
+    private Integer apiDatabaseId = null;
 
-    // AS-IS 호환용 필드
-    @SerializedName("appId")
-    private String appIdByCaPortal;
+    @SerializedName("unauthorizedCount")
+    private Integer authorizedCount = null;
 
-    @SerializedName("portalOrgId")
-    private String orgIdByCaPortal;
+    @SerializedName("backMinTime")
+    private Integer backMinTime = null;
 
-    @SerializedName("portalApiId")
-    private String apiIdByCaPortal;
+    @SerializedName("backMaxTime")
+    private Integer backMaxTime = null;
 
-    @SerializedName("partnerCode")
-    private String partnerCode;
+    @SerializedName("backSumTime")
+    private Integer backSumTime = null;
+
+    @SerializedName("frontMinTime")
+    private Integer frontMinTime = null;
+
+    @SerializedName("frontMaxTime")
+    private Integer frontMaxTime = null;
+
+    @SerializedName("frontSumTime")
+    private Integer frontSumTime = null;
 
-    @SerializedName("apiId")
-    private String apiIdByCa;
 
     /**
      * Entity → DTO 변환
      */
     public static ObpGwMetricDTO from(ObpGwMetric entity) {
         ObpGwMetricDTO dto = new ObpGwMetricDTO();
-        dto.setClientId(entity.getClientId());
-        dto.setHostname(entity.getHostname());
-        dto.setTimeslice(formatTimeslice(entity.getTimeslice()));
+        dto.setApiId(entity.getApiId());
         dto.setApiName(entity.getApiName());
-        dto.setUri(entity.getUri());
-        dto.setMethod(entity.getMethod());
+        dto.setApiRoutingUri(entity.getUri());
+        dto.setHttpMethod(entity.getMethod());
+        dto.setOrgId(entity.getOrgId());
+        dto.setPartnerCode(entity.getPartnerCode());
+        dto.setAppId(entity.getAppId());
+        dto.setAppKey(entity.getClientId());
+        dto.setRequestUri(entity.getRequestUri());
+        dto.setTimeslice(formatTimeslice(entity.getTimeslice()));
         dto.setAttemptedCount(entity.getAttemptedCount());
         dto.setCompletedCount(entity.getCompletedCount());
-        dto.setApiId(entity.getApiId());
-        dto.setAppId(entity.getAppId());
-        dto.setOrgId(entity.getOrgId());
-        dto.setAppIdByCaPortal(entity.getAppIdByCaPortal());
-        dto.setOrgIdByCaPortal(entity.getOrgIdByCaPortal());
-        dto.setApiIdByCaPortal(entity.getApiIdByCaPortal());
-        dto.setPartnerCode(entity.getPartnerCode());
-        dto.setApiIdByCa(entity.getApiIdByCa());
+
+
+        // 260224 - AS-IS 개발자포탈에서 쓰이던 ID 필드 값 삭제(OBP 디비 필드 형식과 맞지 않음)
+        dto.setOrgId(null);
+        dto.setAppId(null);
+
         return dto;
     }
 
     /**
-     * timeslice를 ISO8601 형식 + UTC 시간대로 변환
-     * 예: 2025-12-02T01:00:00+0000
+     * timeslice를 ISO8601 형식 (밀리초 포함) + UTC 시간대로 변환
+     * 예: 2025-12-02T03:00:00.000+0000
      */
     private static String formatTimeslice(LocalDateTime timeslice) {
         if (timeslice == null) return null;
-        return timeslice.format(ISO8601_FORMATTER);
+        return timeslice.format(ISO8601_MILLIS_FORMATTER);
     }
 }
diff --git a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricManService.java b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricManService.java
index 814f13c..72e5c65 100644
--- a/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricManService.java
+++ b/src/main/java/com/eactive/eai/rms/onl/apim/obp/ObpGwMetricManService.java
@@ -311,30 +311,17 @@ public class ObpGwMetricManService extends BaseService {
         return entity;
     }
 
-    /**
-     * 특정 시간대의 GwMetric 데이터 조회 (REST API용)
-     */
-    public List<ObpGwMetricDTO> findByTimeslice(LocalDateTime timeslice) {
-        DataSourceContextHolder.setDataSourceType(
-                DataSourceTypeManager.getDataSourceType(DataSourceTypeManager.MONITORING));
-
-        List<ObpGwMetric> entities = obpGwMetricService.findByTimeslice(timeslice);
-        return entities.stream()
-                .map(ObpGwMetricDTO::from)
-                .collect(Collectors.toList());
-    }
-
     /**
      * 특정 시간대 이후의 GwMetric 데이터 조회 (REST API용)
      * after-timeslice 엔드포인트에서 사용
      */
-    public List<ObpGwMetricAfterDTO> findByTimesliceAfter(LocalDateTime timeslice) {
+    public List<ObpGwMetricDTO> findByTimesliceAfter(LocalDateTime timeslice) {
         DataSourceContextHolder.setDataSourceType(
                 DataSourceTypeManager.getDataSourceType(DataSourceTypeManager.MONITORING));
 
         List<ObpGwMetric> entities = obpGwMetricService.findByTimesliceGreaterThanEqual(timeslice);
         return entities.stream()
-                .map(ObpGwMetricAfterDTO::from)
+                .map(ObpGwMetricDTO::from)
                 .collect(Collectors.toList());
     }