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Alarms
======
Alarms bind alerting rules, entities, and notification plans into a
logical unit. Alarms are responsible for determining a state (``OK``,
``WARNING`` or ``CRITICAL``) based on the result of a Check, and
executing a notification plan whenever that state changes. You create
alerting rules by using the alarm DSL. For information about using the
alarm language, refer to the `reference
documentation <http://docs.rackspace.com/cm/api/v1.0/cm-devguide/content/alerts-language.html>`__.
Setup
-----
In order to interact with this feature, you must first retrieve an entity by
its ID:
.. code-block:: php
$entity = $service->getEntity('{entityId}');
and then a particular check, about which you can configure alarms:
.. code-block:: php
$check = $entity->getCheck('{checkId}');
For more information about these resource types, please consult the documentation
about `entities <entities>`_ and `checks <checks>`_.
Retrieve alarm
--------------
.. code-block:: php
$alarm = $check->getAlarm('{alarmId}');
Once you have access to a ``OpenCloud\Monitoring\Resource\Alarm`` object, these
are the attributes you can access:
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
| Name | Description | Required? | Method |
+==========================+=============================================================================+=============+=================================+
| check_id | The ID of the check to alert on. | Required | ``getCheckId()`` |
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
| notification_plan_id | The ID of the notification plan to execute when the state changes. | Optional | ``getNotificationPlanId()`` |
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
| criteria | The alarm DSL for describing alerting conditions and their output states. | Optional | ``getCriteria()`` |
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
| disabled | Disable processing and alerts on this alarm | Optional | ``isDisabled()`` <``bool``\ > |
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
| label | A friendly label for an alarm. | Optional | ``getLabel()`` |
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
| metadata | Arbitrary key/value pairs. | Optional | ``getMetadata()`` |
+--------------------------+-----------------------------------------------------------------------------+-------------+---------------------------------+
Create Alarm
------------
.. code-block:: php
$alarm = $check->getAlarm();
$alarm->create(array(
'check_id' => 'chAAAA',
'criteria' => 'if (metric["duration"] >= 2) { return new AlarmStatus(OK); } return new AlarmStatus(CRITICAL);',
'notification_plan_id' => 'npAAAAA'
));
List Alarms
-----------
.. code-block:: php
$alarms = $entity->getAlarms();
foreach ($alarms as $alarm) {
echo $alarm->getId();
}
Update Alarm
------------
.. code-block:: php
$alarm->update(array(
'criteria' => 'if (metric["duration"] >= 5) { return new AlarmStatus(OK); } return new AlarmStatus(CRITICAL);'
));
Delete alarm
------------
.. code-block:: php
$alarm->delete();