【Zabbix】「Resolved: Zabbix agent on xxxxxx is unreachable for 5 minutes: Problem has been resolved at 01:36:54 on 2021.06.29 Problem name: Zabbix agent on xxxxxx is unreachable for 5 minutes Host: xxxxxx Severity: Average」が多発する

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Resolved: Zabbix agent on xxxxxx is unreachable for 5 minutes: Problem has been resolved at 01:36:54 on 2021.06.29 
Problem name: Zabbix agent on xxxxxx is unreachable for 5 minutes 
Host: xxxxxx
Severity: Average

サーバ側のzabbix-server.confのTimeoutの値を少し広げてあげると、アラートの嵐は止んだ。

### Option: Timeout
#       Specifies how long we wait for agent, SNMP device or external check (in seconds).
#
# Mandatory: no
# Range: 1-30
# Default:
# Timeout=3

Timeout=10