How to know that the lease key has been deleted

[xiaocai2333]

If I create a lease and attach it with a key, but I delete the key manually. How to let LeaseKeepAlive channel get it and give up renew? Can I only use the Watch?

[SimFG]

You can use the TimeToLive to check whether the lease have been attached to other keys when deleting the key manually. If no key attached to this lease, you can give up renew.