How to delete ghost monitor in ceph cluster

Today , after I let a new server join pve cluster. ceph mon is stopped. I want to start or delete it , I always got a failed notification. After search and try to fix it. At last I fixed it.Here is what I had do

Issue description

root@xa-autotest-hci04:~# pveceph createmon
monitor 'xa-autotest-hci04' already exists
root@xa-autotest-hci04:~# pveceph mon destroy xa-autotest-hci04
no such monitor id 'xa-autotest-hci04'

How to fixed it

#stop ceph-mon@xa-autotest-hci04 service
systemctl stop ceph-mon@xa-autotest-hci04

#Disable ceph-mon@xa-autotest-hci04 service
systemctl disable ceph-mon@xa-autotest-hci04

pveceph purge
rm -rf  /var/lib/ceph/mon/ceph-xa-autotest-hci04

pveceph createmon
#Created symlink /etc/systemd/system/ -> /lib/systemd/system/ceph-mon@.service.