"UNKNOWN" value

[bashman]

Hi,

I have this trigger:

{HOSTNAME:agent.ping.max(600)}<1 | {HOSTNAME:agent.ping.nodata(600)}=1

1. Why does it trigger when it gets an *UNKNOWN* value?. It triggers and recover at the same minute.

2. How does *UNKNOWN* value works?.

3. When an *UNKNOWN* value is received does it always triggers?.

4. How can I add an expression to discard an *UNKNOWN* value?.

Please help.

[bashman]

Can I use "Aggregated checks" to avoid *UNKNOWN* values?

[bashman]

Can Zabbix DB store *UNKNOWN* values?.