Monitoring OpenSearch Serverless with Amazon CloudWatch

You can monitor Amazon OpenSearch Serverless using CloudWatch, which collects raw data and processes it into readable, near real-time metrics. These statistics are kept for 15 months, so that you can access historical information and gain a better perspective on how your web application or service is performing.

You can also set alarms that watch for certain thresholds, and send notifications or take actions when those thresholds are met. For more information, see the Amazon CloudWatch User Guide.

OpenSearch Serverless reports the following metrics in the AWS/AOSS namespace.

Metric	Description
ActiveCollection	Indicates whether a collection is active. A value of 1 means that the collection is in an ACTIVE state. This value is emitted upon successful creation of a collection and remains 1 until you delete the collection. The metric can't have a value of 0. Relevant statistics: Max Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
DeletedDocuments	The total number of deleted documents. Relevant statistics: Average, Sum Dimensions: ClientId, CollectionId, CollectionName, IndexId, IndexName Frequency: 60 seconds
IndexingOCU	The number of OpenSearch Compute Units (OCUs) used to ingest collection data. This metric applies at the account level. Relevant statistics: Sum Dimensions: ClientId Frequency: 60 seconds
IngestionDataRate	The indexing rate in GiB per second to a collection or index. This metric only applies to bulk indexing requests. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName, IndexId, IndexName Frequency: 60 seconds
IngestionDocumentErrors	The total number of document errors during ingestion for a collection or index. After a successful bulk indexing request, writers process the request and emit errors for all failed documents within the request. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName, IndexId, IndexName Frequency: 60 seconds
IngestionDocumentRate	The rate per second at which documents are being ingested to a collection or index. This metric only applies to bulk indexing requests. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName, IndexId, IndexName Frequency: 60 seconds
IngestionRequestErrors	The total number of bulk indexing request errors to a collection. OpenSearch Serverless emits this metric when a bulk indexing request fails for any reason, such as an authentication or availability issue. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
IngestionRequestLatency	The latency, in seconds, for bulk write operations to a collection. Relevant statistics: Minimum, Maximum, Average Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
IngestionRequestRate	The total number of bulk write operations received by a collection. Relevant statistics: Minimum, Maximum, Average Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
IngestionRequestSuccess	The total number of successful indexing operations to a collection. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
SearchableDocuments	The total number of searchable documents in a collection or index. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName, IndexId, IndexName Frequency: 60 seconds
SearchRequestErrors	The total number of query errors per minute for a collection. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
SearchRequestLatency	The average time, in milliseconds, that it takes to complete a search operation against a collection. Relevant statistics: Minimum, Maximum, Average Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
SearchOCU	The number of OpenSearch Compute Units (OCUs) used to search collection data. This metric applies at the account level. Relevant statistics: Sum Dimensions: ClientId Frequency: 60 seconds
SearchRequestRate	The total number of search requests per minute to a collection. Relevant statistics: Average, Maximum, Sum Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds
StorageUsedInS3	The amount, in bytes, of Amazon S3 storage used. OpenSearch Serverless stores indexed data in Amazon S3. You must select the period at one minute to get an accurate value. Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName, IndexId, IndexName Frequency: 60 seconds
2xx, 3xx, 4xx, 5xx	The number of requests to the collection that resulted in the given HTTP response code (2xx, 3xx, 4xx, 5xx). Relevant statistics: Sum Dimensions: ClientId, CollectionId, CollectionName Frequency: 60 seconds