doc: Add chapter Automation

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# Automation
It is possible to issue command actions without a browser. To do so, a form needs to be submitted by a tool such as
cUrl. This is also used in the example below.
## Request Format
The request is required to be an Icinga Web API request. For this it is necessary to transmit the `Accept` HTTP header
and set it to `application/json`. In addition to this, the request must be authenticated using the `Basic` schema.
All endpoints support filters. To issue commands only for specific items, define a filter in the request's query string.
If this filter is omitted, all items are affected.
The options need to be transmitted in the request body as `multipart/form-data`.
## Response Format
If the request succeeds, the HTTP response code is `200` and the response body contains a JSON object such as this:
```json
{
"status": "success",
"data": [
{
"type": "success",
"message": "Added comment successfully"
}
]
}
```
If there's something wrong with the options, the HTTP response code is `422` and the response body contains a JSON
object such as this:
```json
{
"status": "fail",
"data": {
"comment": [],
"expire": [],
"expire_time": ["The expire time must not be in the past"]
}
}
```
## Example
```shell
USER="icingaadmin"
PASSWORD="icinga"
BASEURL="http://localhost/icingaweb2"
FILTER="host.name=docker-master"
curl -H "Accept: application/json" -u $USER:$PASSWORD "$BASEURL/icingadb/hosts/add-comment?$FILTER" \
-F "comment=kaput" -F "expire_time=2023-10-05T20:00:00" -F "expire=y"
```
## Option Types
### Text
A simple text message. May contain newlines.
### Number
An integer value.
### BoolEnum
A string with the value of `y` for `true` and `n` for `false`.
### DateTime
A date time string in the following format: `Y-m-d\TH:i:s`
The timezone this is interpreted in depends on the user who's transmitting the request.
To change this, log in as this user and change its preference setting.
### State
| Value | Description | Applicable To |
|-------|----------------|----------------|
| 0 | UP / OK | Host / Service |
| 1 | DOWN / WARNING | Host / Service |
| 2 | CRITICAL | Service |
| 3 | UNKNOWN | Service |
### PerfData
Please have a look at the [Monitoring Plugins Development Guidelines](https://www.monitoring-plugins.org/doc/guidelines.html#AEN201).
### ChildOption
| Value | Description |
|-------|-----------------------------------------------------|
| 0 | Do nothing with child hosts |
| 1 | Schedule triggered downtime for all child hosts |
| 2 | Schedule non-triggered downtime for all child hosts |
## Endpoints
### Acknowledge Problem
#### Routes
* icingadb/hosts/acknowledge
* icingadb/services/acknowledge
#### Options
| Option | Required | Type | Depends On |
|-------------|----------|----------|------------|
| comment | y | Text | - |
| persistent | n | BoolEnum | - |
| notify | n | BoolEnum | - |
| sticky | n | BoolEnum | - |
| expire | n | BoolEnum | - |
| expire_time | y | DateTime | expire |
### Add Comment
#### Routes
* icingadb/hosts/add-comment
* icingadb/services/add-comment
#### Options
| Option | Required | Type | Depends On |
|-------------|----------|----------|------------|
| comment | y | Text | - |
| expire | n | BoolEnum | - |
| expire_time | y | DateTime | expire |
### Check Now
#### Routes
* icingadb/hosts/check-now
* icingadb/services/check-now
#### Options
None.
### Process Check Result
#### Routes
* icingadb/hosts/process-checkresult
* icingadb/services/process-checkresult
#### Options
| Option | Required | Type |
|----------|----------|----------|
| status | y | State |
| output | y | Text |
| perfdata | n | PerfData |
### Remove Acknowledgement
#### Routes
* icingadb/hosts/remove-acknowledgement
* icingadb/services/remove-acknowledgement
#### Options
None.
### Schedule Check
#### Routes
* icingadb/hosts/schedule-check
* icingadb/services/schedule-check
#### Options
| Option | Required | Type |
|-------------|----------|----------|
| check_time | y | DateTime |
| force_check | n | BoolEnum |
### Schedule Host Downtime
#### Routes
* icingadb/hosts/schedule-downtime
#### Options
| Option | Required | Type | Depends On |
|---------------|----------|-------------|------------|
| comment | y | Text | - |
| start | y | DateTime | - |
| end | y | DateTime | - |
| flexible | n | BoolEnum | - |
| hours | y | Number | flexible |
| minutes | y | Number | flexible |
| all_services | n | BoolEnum | - |
| child_options | n | ChildOption | - |
### Schedule Service Downtime
#### Routes
* icingadb/services/schedule-check
#### Options
| Option | Required | Type | Depends On |
|----------|----------|-------------|------------|
| comment | y | Text | - |
| start | y | DateTime | - |
| end | y | DateTime | - |
| flexible | n | BoolEnum | - |
| hours | y | Number | flexible |
| minutes | y | Number | flexible |
### Send Custom Notification
#### Routes
* icingadb/hosts/send-custom-notification
* icingadb/services/send-custom-notification
#### Options
| Option | Required | Type |
|---------|----------|----------|
| comment | y | Text |
| forced | n | BoolEnum |