NetScaler licenses could enforce bandwidth throughput limitation which results in the NetScaler dropping network packets. MetrixInsight for NetScaler tracks packets being dropped due to NetScaler license limit exceedance.
Are you aware when Denial-of-Service (DoS) JavaScript triggers occur on your Citrix NetScaler devices to block DoS attacks? Do you know when exceptions are made based on 'valid' DoS cookies? MetrixInsight for NetScaler monitors for these occurrences and alarms you whenever this happens (too often).