We have published the techincal document TEC1091156 with details on one example for Citrix Netscaler devices for the limitation of default metric families in snmpcollector probe version 3.30 compared to snmpcollector probe 2.26 and the available configuration options in the snmpcollector probe version 3.30.
https://www.ca.com/us/services-support/ca-support/ca-support-online/knowledge-base-articles.TEC1091156.html