doc: Add monitoring chapter

doc/10-Monitoring.md

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+# Monitoring
+
+## Process Check Command
+
+The module provides a CLI command to check a business process.
+
+### Usage
+
+General: `icingacli businessprocess process check <process> [options]`
+
+Options:
+
+```
+  --config <configname>   Name of the config that contains <process>
+  --details               Show problem details as a tree
+  --colors                Show colored output
+  --state-type <type>     Define which state type to look at. Could be either soft
+                          or hard, overrides an eventually configured default
+  --blame                 Show problem details as a tree reduced to the nodes
+                          which have the same state as the business process
+  --root-cause            Used in combination with --blame. Only shows
+                          the path of the nodes which are responsible
+                          for the state of the business process
+  --downtime-is-ok        Treat hosts/services in downtime always as UP/OK.
+  --ack-is-ok             Treat acknowledged hosts/services always as UP/OK.
+```
+
+### Detail View Integration
+
+It is possible to show the monitored process in the service detail view.
+
+For this to work, the name of the checkcommand configured in Icinga 2 must either
+be `icingacli-businessprocess` or the name that can be configured in the module
+configuration:
+
+**/etc/icingaweb2/modules/businessprocess/config.ini**
+```ini
+[DetailviewExtension]
+checkcommand_name=businessprocess-check
+```
+
+A service can define specific custom variables for this. Some are mandatory.
+If they are not defined, the detail view integration won't be active.
+
+| Variable Name             | Mandatory | Description                                  |
+|---------------------------|-----------|----------------------------------------------|
+| businessprocess\_process  | Yes       | The `<process>` being checked                |
+| businessprocess\_config   | Yes       | Name of the config that contains `<process>` |
+| businessprocess\_as\_tree | No        | Whether to show `<process>` as tree or tiles |