# Recommended CloudWatch alarms for Amazon OpenSearch Service
Recommended CloudWatch alarms

CloudWatch alarms perform an action when a CloudWatch metric exceeds a specified value for some amount of time. For example, you might want AWS to email you if your cluster health status is `red` for longer than one minute. This section includes some recommended alarms for Amazon OpenSearch Service and how to respond to them.

You can automatically deploy these alarms using CloudFormation. For a sample stack, see the related [GitHub repository](https://github.com/ev2900/OpenSearch_CloudWatch_Alarms).

**Note**  
If you deploy the CloudFormation stack, the `KMSKeyError` and `KMSKeyInaccessible` alarms will exists in an `Insufficient Data` state because these metrics only appear if a domain encounters a problem with its encryption key.

For more information about configuring alarms, see [Creating Amazon CloudWatch Alarms](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html) in the *Amazon CloudWatch User Guide*.

[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/opensearch-service/latest/developerguide/cloudwatch-alarms.html)

**Note**  
If you just want to *view* metrics, see [Monitoring OpenSearch cluster metrics with Amazon CloudWatch](managedomains-cloudwatchmetrics.md).

## Other alarms you might consider


Consider configuring the following alarms depending on which OpenSearch Service features you regularly use. 

[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/opensearch-service/latest/developerguide/cloudwatch-alarms.html)