This change fixes the calculation by using timestamp subtraction (WAL
confirmed time - Last replicate time). This ensures the lag metric
immediately spikes when replication is blocked, providing reliable
monitoring.
issue: https://github.com/milvus-io/milvus/issues/46116
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
issue: #44123
- support replicate message in wal of milvus.
- support CDC-replicate recovery from wal.
- fix some CDC replicator bugs
Signed-off-by: chyezh <chyezh@outlook.com>