two items with keys :

• net.if.in[eth0,bytes]
• net.if.out[eth0,bytes]

are in unsupported state. the error message is just "Not supported by Zabbix Agent".

both items are passive, "delta per second", numeric (float). they work just fine with zabbix_get and server is getting values, too:

  8378:20150402:175802.388 In get_value_agent() host:'Zabbix.org' addr:'127.0.0.1' key:'net.if.in[eth0,bytes]'
  8378:20150402:175802.389 Sending [net.if.in[eth0,bytes]
]
  8378:20150402:175802.390 get value from agent result: '52616517916'
  8378:20150402:175802.390 End of get_value():SUCCEED

server logs do not show the initial error message. weird thing is, both items get values just fine.

server started at 20150402:151030, thus it's a trunk checkout a couple of minutes before that