[no data] to zero value

[megumi1124]

Hi

Is there a way to change (handle?) [no data] to a zero value?

Let's say there are X, Y, and Z values from three connections.
X and Y have some number and if Z is [no value],
I can't seem to do a calculation ex) X + Y + Z.
It would be best if Z=0, not [no data]

Also, this is a slightly different question..
Is there a way to instantly flush the old data?
Let's say some value A existed while the eth0 was still alive.
Even after the eth0 is disconnected, the graph will still show me the value A for a while, while I want that value to be 0.

Thanks in advance.

[zalex_ua]

Also, this is a slightly different question..
Is there a way to instantly flush the old data?
Let's say some value A existed while the eth0 was still alive.
Even after the eth0 is disconnected, the graph will still show me the value A for a while, while I want that value to be 0.

Thanks in advance.

check

define('ZBX_GRAPH_MAX_SKIP_DELAY',      4);

in a file include/defines.inc.php

but if I remember correctly it is ignored for zabbix trapper items