zabbix 如何解决频繁波动告警问题

当一个告警频繁被出发时，需要考虑使用Hysteresis功能。

官方文档：https://www.zabbix.com/documentation/3.0/manual/config/triggers/expression

以下摘自官方文档：

5 Hysteresis

Sometimes a trigger must have different conditions for different states. For example, we would like to define a trigger which would become PROBLEM when server room temperature is higher than 20C while it should stay in the state until temperature will not become lower than 15C.

In order to do this, we define the following trigger:

Example 1

Temperature in server room is too high

({TRIGGER.VALUE}=0 and {server:temp.last()}>20) or
({TRIGGER.VALUE}=1 and {server:temp.last()}>15)
Note the use of a macro {TRIGGER.VALUE}. The macro returns current trigger value.

Example 2

Free disk space is too low

Problem: it is less than 10GB for last 5 minutes

Recovery: it is more than 40GB for last 10 minutes

({TRIGGER.VALUE}=0 and {server:vfs.fs.size[/,free].max(5m)}<10G) or
({TRIGGER.VALUE}=1 and {server:vfs.fs.size[/,free].min(10m)}<40G)
Note use of {TRIGGER.VALUE} macro. The macro returns current trigger value.