The following note is on page 18 in the 8.0.1 Release Notes:

" Multi-Server Environment Upgrade Steps "
...
" IMPORTANT: Certificates. If self-signed certificates are used, after the LDAP
master is upgraded, the self-signed certificates must be redeployed on all
remaining nodes
BEFORE they are upgraded. If you do not do this, the
upgrade will fail. Use CLI zmcertmgr to add the certificates. As root, type

/opt/zimbra/bin/zmcertmgr deploycrt self "

...

Does "all remaining nodes" refer to all LDAP-replicas or does it refer to all servers in the Multi-server installation, ie mta, proxy and storage servers?