ccr数据同步成功了,但是执行get_lag的last_binlog_timestamp和first_binlog_timestamp为什么都是1970-01-01 08:00:00，我该怎么查看上次同步时间呢

curl -X POST -H "Content-Type: application/json" -d '{

"name": "ccr_test2"

}' http://192.168.40.130:9190/get_lag

{"success":true,"lag":0,"first_commit_seq":0,"last_commit_seq":0,"first_binlog_timestamp":"1970-01-01 08:00:00","last_binlog_timestamp":"1970-01-01 08:00:00","time_interval_secs":0,"next_commit_seq":0,"next_binlog_timestamp":"1970-01-01 08:00:00"}