diff --git oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStoreGCMonitor.java oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStoreGCMonitor.java
index a9a77b7..c455cfe 100644
--- oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStoreGCMonitor.java
+++ oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/FileStoreGCMonitor.java
@@ -153,17 +153,4 @@ public class FileStoreGCMonitor extends AnnotatedStandardMBean
     public String getStatus() {
         return status;
     }
-
-    @Nonnull
-    @Override
-    public CompositeData getRepositorySize() {
-        return asCompositeData(repositorySize, "RepositorySize");
-    }
-
-    @Nonnull
-    @Override
-    public CompositeData getReclaimedSize() {
-        return asCompositeData(reclaimedSize, "ReclaimedSize");
-    }
-
 }
diff --git oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/GCMonitorMBean.java oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/GCMonitorMBean.java
index e5d5b60..a65e8fc 100644
--- oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/GCMonitorMBean.java
+++ oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/file/GCMonitorMBean.java
@@ -21,9 +21,7 @@ package org.apache.jackrabbit.oak.segment.file;
 
 import javax.annotation.CheckForNull;
 import javax.annotation.Nonnull;
-import javax.management.openmbean.CompositeData;
 
-// FIXME OAK-4618: Align GCMonitorMBean MBean with new generation based GC
 /**
  * MBean for monitoring the revision garbage collection process of the
  * {@link FileStore}.
@@ -64,16 +62,4 @@ public interface GCMonitorMBean {
      */
     @Nonnull
     String getStatus();
-
-    /**
-     * @return  time series of the repository size
-     */
-    @Nonnull
-    CompositeData getRepositorySize();
-
-    /**
-     * @return  time series of the reclaimed space
-     */
-    @Nonnull
-    CompositeData getReclaimedSize();
 }