Monitor your Zabbix proxies!
Rédigé par uTuxWe had that crazy situation where a Zabbix Proxy was down (VM stopped) and we had no idea about it.
That was quite the surprise because "Well, we should have had a crapload of 'No data' alerts from every host that report to that proxy". Spoiler alert: No, we didn't. We lost monitoring over hundreds of hosts for 24+ hours and everything was fine in Zabbix UI. In fact I realized that situation when the network engineer asked me why his Zabbix dashboards were empty.