It looks like you are confused about how NPM licensing works. As the message indicates, your license allows you to monitor a max of 700 disk volumes. Since your servers have multiple disks even with 100 servers in you have exceeded the limit of the license you bought. The only solutions are to monitor fewer disks or to buy larger licenses.
Physical and virtual memory also count against volumes. you may want to remove those for the nodes you don't need to monitor
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