config.ini | Security settings (e.g. protected custom vars) for the `monitoring` module |
[backends.ini](04-Backends.md#monitoring-module-backends) | Data backend (e.g. the IDO database [resource](../../../doc/04-Resources.md#resources-configuration-database) name).
[commandtransports.ini](05-Command-Transports.md) | Command transports for specific Icinga instances
acknowledge_expire | **Optional.** Check "Use Expire Time" in Acknowledgement dialog by default. Defaults to **0 (false)**.
acknowledge_expire_time | **Optional.** Set default value for "Expire Time" in Acknowledgement dialog, its calculated as now + this setting. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). Defaults to **1 hour (PT1H)**.
acknowledge_notify | **Optional.** Check "Send Notification" in Acknowledgement dialog by default. Defaults to **1 (true)**.
acknowledge_persistent | **Optional.** Check "Persistent Comment" in Acknowledgement dialog by default. Defaults to **0 (false)**.
acknowledge_sticky | **Optional.** Check "Sticky Acknowledgement" in Acknowledgement dialog by default. Defaults to **0 (false)**.
custom_notification_forced | **Optional.** Check "Forced" in Custom Notification dialog by default. Defaults to **0 (false)**.
hostcheck_all_services | **Optional.** Check "All Services" in Schedule Host Check dialog by default. Defaults to **0 (false)**.
hostdowntime_all_services | **Optional.** Check "All Services" in Schedule Host Downtime dialog by default. Defaults to **0 (false)**.
Example for having acknowledgements with 2 hours expire time by default.
```
# vim /etc/icingaweb2/modules/monitoring/config.ini