Steps to reproduce:
- on centos 7 run multiple rsyncs
active data will not be populated in the zabbix server passive will still work.
telnet to port 10051 will still work
in zabbix agent no errors are visible
zabbix-get will show items with data once the rsync is stopped everything will work
the solution was to run tuned-adm profile network-latency
the expected behaviour would be zabbix agent complaining that it cannot send information to the zabbix server