Adding plasma storage graphs
Adding plasma storage graphs

Change-Id: Ide00b5141fe5afe16d24c718e4441066038ee2d9
Reviewed-on: https://review.couchbase.org/c/cbmonitor/+/171257
Tested-by: vikas chaudhary <c251871a64d7d31888eace0406cb3d4c419d5f73@couchbase.com>
Reviewed-by: vikas chaudhary <c251871a64d7d31888eace0406cb3d4c419d5f73@couchbase.com>

couchbase/cbmonitor,couchbase/cbmonitor