system.swap.* items cause the zabbix agent to hang on Solaris 11 zones. This is the same problem as
ZBX-7697, but where that affected Solaris 10 & 11 servers. This seems to only affect Solaris 11 zones, the non global zone seems okay. A solaris 10 zone seems fine as well.
I'm attaching a debug 4 log from the agent.