# Monitoring data

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/amazon-opensearch-service-developer-guide.git)
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## Alerting

* **Note**\
  OpenSearch notifications are separate from OpenSearch Service [notifications](https://github.com/kevinslin/aws-reference-notes/blob/main/services/amazon_open_search_service/managedomains-notifications.md), which provide details about service software updates, Auto-Tune enhancements, and other important domain-level information. OpenSearch notifications are plugin-specific.

## Anomaly detection

* **Note**\
  The `count()` aggregation method is only available in OpenSearch and Elasticsearch 7.7 or later. For Elasticsearch 7.4, use a custom expression like the following: