Currently we can only see Trend Function  Cache  overall size from server configuration file as set by TrendFunctionCacheSize parameter. Also we can see cache effectiveness from zabbix internal item zabbix[tcache,<cache>,<parameter>]

But we cannot see trend function cache utilization. For proper configuration and troubleshooting it is needed to view Trend Functon Cache utilziation similar to Trend Cache  zabbix[wcache,trend,<parameter>] where parameter is one of total,free,used,pused.

Please implement  additional internal checks for Trendf Fnction Cache monitoring.

It may useful for zabbix admins  to view all  cache stats at server runtime  similar to history  cache and valuecache.  i.e.  zabbix_server -R diaginfo=trendcache and zabbix_server -R diaginfo=functiontrendcache (any cache - configuration,vmware)