Each of Aodh’s services are designed to scale horizontally. Additional workers and nodes can be added depending on the expected load. It provides daemons to evaluate and notify based on defined alarming rules.
The alarming component of Aodh, first delivered in the Havana version, allows you to set alarms based on threshold evaluation for a collection of samples. An alarm can be set on a single meter, or on a combination. For example, you may want to trigger an alarm when the memory consumption reaches 70% on a given instance if the instance has been up for more than 10 min. To setup an alarm, you will call Aodh’s API server specifying the alarm conditions and an action to take.
Of course, if you are not administrator of the cloud itself, you can only set alarms on meters for your own components.
There can be multiple form of actions, but two have been implemented so far:
For more details on this, we recommend that you read the blog post by Mehdi Abaakouk Autoscaling with Heat and Ceilometer. Particular attention should be given to the section “Some notes about deploying alarming” as the database setup (using a separate database from the one used for metering) will be critical in all cases of production deployment.
Alarm Combinarion Rule
Describe when to trigger the alarm based on combining the state of other alarms.
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No documentation found in gnocchi_aggregation_by_metrics_threshold = aodh.api.controllers.v2.alarm_rules.gnocchi:AggregationMetricsByIdLookupRule
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No documentation found in gnocchi_aggregation_by_resources_threshold = aodh.api.controllers.v2.alarm_rules.gnocchi:AggregationMetricByResourcesLookupRule
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No documentation found in gnocchi_resources_threshold = aodh.api.controllers.v2.alarm_rules.gnocchi:MetricOfResourceRule
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No documentation found in combination = aodh.evaluator.combination:CombinationEvaluator
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No documentation found in gnocchi_aggregation_by_metrics_threshold = aodh.evaluator.gnocchi:GnocchiThresholdEvaluator
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No documentation found in gnocchi_aggregation_by_resources_threshold = aodh.evaluator.gnocchi:GnocchiThresholdEvaluator
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No documentation found in gnocchi_resources_threshold = aodh.evaluator.gnocchi:GnocchiThresholdEvaluator
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No documentation found in threshold = aodh.evaluator.threshold:ThresholdEvaluator
Rest alarm notifier.
Rest alarm notifier.
Log alarm notifier.
Test alarm notifier.
Notifier supporting keystone trust authentication.
This alarm notifier is intended to be used to call an endpoint using keystone authentication. It uses the aodh service user to authenticate using the trust ID provided.
The URL must be in the form trust+http://trust-id@host/action.
Notifier supporting keystone trust authentication.
This alarm notifier is intended to be used to call an endpoint using keystone authentication. It uses the aodh service user to authenticate using the trust ID provided.
The URL must be in the form trust+http://trust-id@host/action.