If you take a snapshot of your existing server and provision a new one, you will need to change the ID of the monitoring agent for the new server to appear on the server list.
Please follow the procedure:
Edit the file:
/etc/cloudstats/server.key
Enter any Random ID into this file, but with the same number of characters.
Restart the monitoring agent:
service cloudstats-agent restart
After this the newly provisioned server should appear on your server list.