[IOTDB-6082] Improve disk space metrics (#10983)

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/protocol/thrift/impl/DataNodeInternalRPCServiceImpl.java

@@ -1300,6 +1300,10 @@ public class DataNodeInternalRPCServiceImpl implements IDataNodeRPCService.Iface
             commonConfig.getDiskSpaceWarningThreshold());
         commonConfig.setNodeStatus(NodeStatus.ReadOnly);
         commonConfig.setStatusReason(NodeStatus.DISK_FULL);
+      } else if (commonConfig.getNodeStatus().equals(NodeStatus.ReadOnly)
+          && commonConfig.getStatusReason().equals(NodeStatus.DISK_FULL)) {
+        commonConfig.setNodeStatus(NodeStatus.Running);
+        commonConfig.setStatusReason(null);
       }
     }
   }