Bug Report

We have encountered many cases where the PD leader drops due to the lease keep-alive failure. But the etcd leader is not changed. This issue significantly affects the user's business.
It isn't recommended to create a lease with short TTL (e.g. < 5s), because obviously it may be affected by either server-side or client-side delay. See etcd-io/etcd#18091 (reply in thread).
We should change the default value of the lease.