Monitoring memory with zabbix for oracle sparc T8-1 server with Solaris 11.4

Anyone use zabbix to monitor free memory on Solaris 11.4 servers. We are getting strange alerts for low available memory at random times. It seems to show all memory getting used up and then being released after 4 minutes or so.

Just wondering if anyone else has noticed this.

I can't find any reason for this memory consumption or a pattern to this. I find it difficult to spot until it is too late to check what is using the memory at the time. I looked in the statsstore and cannot see any pattern of this in the memory collection.

I was wondering if it was just the zfs cache doing its job - using the memory up and releasing it when needed.