# Event metrics and attribution reports
<a name="event-metrics"></a>

To monitor the type and number of events sent to Amazon Personalize, use Amazon CloudWatch metrics. For more information, see [Monitoring Amazon Personalize with Amazon CloudWatch](personalize-monitoring.md). 

 To generate CloudWatch reports that show the impact of recommendations, create a metric attribution and record user interactions with real-time recommendations. For information on creating a metric attribution, see [Measuring the impact of Amazon Personalize recommendations](measuring-recommendation-impact.md). 

 For each event, include recommendation ID of the recommendations you showed the user. Or include the event source, such as a third party. Import this data to compare different campaigns, recommenders, and third parties. You can import at most 100 event attribution sources. 
+  If you provide a `recommendationId`, Amazon Personalize automatically determines the source campaign or recommender and identifies it in reports in an EVENT\_ATTRIBUTION\_SOURCE column. 
+  If you provide both attributes, Amazon Personalize uses only the `eventAttributionSource`. 
+  If you don't provide a source, Amazon Personalize labels the source `SOURCE_NAME_UNDEFINED` in reports. 

 The following code shows how to provide an `eventAttributionSource` for an event in a PutEvents operation. 

```
response = personalize_events.put_events(
    trackingId = '{{eventTrackerId}}',
    userId= '{{userId}}',
    sessionId = '{{sessionId123}}',
    eventList = [{
        'eventId': '{{event1}}',
        'eventType': '{{watch}}',
        'sentAt': '{{1667260945}}',
        'itemId': '{{123}}',
        'metricAttribution': { 
            'eventAttributionSource': '{{thirdPartyServiceXYZ}}'
        }
    }]
)
statusCode = response['ResponseMetadata']['HTTPStatusCode']
print(statusCode)
```

The following code shows how to provide a `recommendationId` for an event in a PutEvents operation.

```
response = personalize_events.put_events(
    trackingId = '{{eventTrackerId}}',
    userId= '{{userId}}',
    sessionId = '{{sessionId123}}',
    eventList = [{
        'eventId': '{{event1}}',
        'eventType': '{{watch}}',
        'sentAt': '{{1667260945}}',
        'itemId': '{{123}}',
        'recommendationId': '{{RID-12345678-1234-1234-1234-abcdefghijkl}}'
    }]
)
statusCode = response['ResponseMetadata']['HTTPStatusCode']
print(statusCode)
```