# Viewing metrics
<a name="custom-metrics"></a>

After a sync job is finished, you can use the `DataSourceSyncJobMetrics` API operation to get the metrics associated with the sync job. Use this API operation to monitor your custom data source syncs.

You can submit the same document multiple times, either as part of the `BatchPutDocument` operation, the `BatchDeleteDocument` operation, or if the document is submitted for both addition and deletion, Regardless of how you submit the document, it is only counted once in the metrics.
+ `DocumentsAdded` – The number of documents submitted using the `BatchPutDocument` operation associated with this sync job that are added to the index for the first time. If a document is submitted for addition more than once in a sync, the document is only counted once in the metrics.
+ `DocumentsDeleted` – The number of documents submitted using the `BatchDeleteDocument` operation associated with this sync job that are deleted from the index. If a document is submitted for deletion more than once in a sync, the document is only counted once in the metrics.
+ `DocumentsFailed` – The number of documents associated with this sync job that failed indexing. These documents were accepted by Amazon Q for indexing but could not be indexed or deleted. If a document isn't accepted by Amazon Q, the identifier for the document is returned in the `FailedDocuments` response property of the `BatchPutDocument` and `BatchDeleteDocument` operations.
+ `DocumentsModified` – The number of modified documents submitted using the `BatchPutDocument` operation associated with this sync job that were modified in the Amazon Q index.

Amazon Q also emits Amazon CloudWatch metrics while indexing documents. For more information, see [Monitoring Amazon Q with Amazon CloudWatch](https://docs.aws.amazon.com/amazonq/latest/qbusiness-ug/monitoring-cloudwatch.html).

Amazon Q doesn't return the `DocumentsScanned` metric for custom data sources.