Add document for the configuration of the IcingaDB-Modul (#971)

This adds a listing of the possible settings for the module in the
configuration files.
It is quite similar to the monitoring module, but wasn't documented for
this one.

---------

Co-authored-by: Johannes Meyer <[email protected]>

doc/03-Configuration.md

@@ -61,6 +61,45 @@ For this you need an `ApiUser` object with at least the following permissions on
     also configure the secondary master's API command transport.
     Icinga DB Web then uses this transport if the primary one is not available.
 
+## General Configuration
+
+You can adjust some default values of options users have while interacting with particular dialogs in the UI. (e.g. While acknowledging a problem)
+These options can not be adjusted in the UI directly, but have to be set in the
+configuration file `/etc/icingaweb2/modules/icingadb/config.ini`.
+
+### Available Settings and defaults
+
+Option                            | Description                      | Default
+----------------------------------|-----------------------------------|------------
+acknowledge_expire                | Sets "Use Expire Time" in Acknowledgement dialog. | **0 (false)**
+acknowledge_expire_time           | Sets the 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). | **1 hour (PT1H)**.
+acknowledge_notify                | Sets "Send Notification" in Acknowledgement dialog. | **1 (true)**
+acknowledge_persistent            | Sets "Persistent Comment" in Acknowledgement dialog. | **0 (false)**
+acknowledge_sticky                | Sets "Sticky Acknowledgement" in Acknowledgement dialog. | **0 (false)**
+comment_expire                    | Sets "Use Expire Time" in Comment dialog. | **0 (false)**
+hostdowntime_comment_text         | Sets default text for "Comment" in Host Downtime dialog | ""
+servicedowntime_comment_text      | Sets default text for "Comment" in Service Downtime dialog. | ""
+comment_expire_time               | Sets default value for "Expire Time" in Comment dialog, its calculated as now + this setting. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **1 hour (PT1H)**
+custom_notification_forced        | Sets "Forced" in Custom Notification dialog. | **0 (false)**
+hostdowntime_all_services         | Sets "All Services" in Schedule Host Downtime dialog. | **0 (false)**
+hostdowntime_end_fixed            | Sets default value for "End Time" in Schedule Host Downtime dialog for **Fixed** downtime, its calculated as now + this setting. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **1 hour (PT1H)**.
+hostdowntime_end_flexible         | Sets default value for "End Time" in Schedule Host Downtime dialog for **Flexible** downtime, its calculated as now + this setting. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **2 hours (PT2H)**.
+hostdowntime_flexible_duration    | Sets default value for "Flexible Duration" in Schedule Host Downtime dialog for **Flexible** downtime. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **2 hour (PT2H)**.
+servicedowntime_end_fixed         | Sets default value for "End Time" in Schedule Service Downtime dialog for **Fixed** downtime, its calculated as now + this setting. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **1 hour (PT1H)**.
+servicedowntime_end_flexible      | Set default value for "End Time" in Schedule Service Downtime dialog for **Flexible** downtime, its calculated as now + this setting. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **1 hour (PT1H)**.
+servicedowntime_flexible_duration | Set default value for "Flexible Duration" in Schedule Service Downtime dialog for **Flexible** downtime. Format is a [PHP Dateinterval](http://www.php.net/manual/en/dateinterval.construct.php). | **2 hour (PT2H)**.
+
+
+### Example
+
+Setting acknowledgements with 2 hours expire time by default.
+
+```
+[settings]
+acknowledge_expire = 1
+acknowledge_expire_time = PT2H
+```
+
 ## Security
 
 To grant users permissions to run commands and restrict them to specific views,

doc/10-Migration.md

@@ -8,6 +8,18 @@ If that is the case, this chapter has you covered.
 
 ## Configuration
 
+### General configuration via config.ini
+
+Icinga DB Web still uses the same configuration format as the monitoring module. This means that the file
+`/etc/icingaweb2/modules/monitoring/config.ini` can simply be copied over to
+`/etc/icingaweb2/modules/icingadb/config.ini`:
+
+```
+cp /etc/icingaweb2/modules/monitoring/config.ini /etc/icingaweb2/modules/icingadb/config.ini
+```
+
+The behaviour of those options remains the same.
+
 ### Command Transports
 
 Icinga DB Web still uses the same configuration format for command transports. This means that the file
@@ -158,3 +170,4 @@ general access to the monitoring module, this is not automatically migrated. You
 It gives you the chance to review the performed changes, before letting them loose on your users. Please also
 take in mind, that Icinga DB Web handles permissions and restrictions differently. Our blog provides details
 on that: https://icinga.com/blog/2021/04/07/web-access-control-redefined/#icingadb-permission-linkage
+