Hello,
First of all, data must be uploaded periodically to all collectors from CM Buffer Usage Monitor (Reports> Report Configuration Tools> Custom Table Builder).
Please follow the steps below for details.
https://www.ibm.com/support/knowledgecenter/SSMPHH_11.1.0/com.ibm.guardium.doc.admin/adm/unit_utilization_configure.html
#Guardium#Support#SupportMigration