With SLA monitoring configured, we can happily proceed with making sure our systems run smoothly; we do some maintenance during a properly scheduled maintenance period, only to discover that our SLA level has dropped. Were you sure downtime during maintenance periods wouldn't be counted against the SLA monitoring? Wrong. Zabbix host and host group-level maintenance doesn't affect SLA monitoring. If something is down during such a maintenance, Zabbix still considers that as an unacceptable unavailability of the service.
Host and host group-level maintenance was discussed in Chapter 5, Managing Hosts, Users, and Permissions.
There's a way to avoid calculating SLA data for a specific period, though.
Let's go to Configuration | Services and click on Code repository. In the service properties, switch to the Time tab. Here, we can add...