After upgrade to 2.2, Templates for FreeBSD and OpenBSD had several incorrect prototypes (item and graph prototypes in network interface low level discovery). In order to fix them, please delete Template OS FreeBSD and Template OS OpenBSD in Configuration → Templates and import these two templates from https://www.zabbix.org/wiki/Zabbix_Templates/Official_Templates.
Log messages regarding availability of a particular type of checks on a host now include item key and host name in double quotes. Previously, they were included in square brackets:
Zabbix agent item [net.if.in[eth0]] on host [server1] failed: first network error, wait for 15 seconds
was changed to
Zabbix agent item "net.if.in[eth0]" on host "server1" failed: first network error, wait for 15 seconds