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# Suivi des publicités superposées à l'aide de métadonnées côté client
<a name="overlay-ads-client-side-tracking-metadata"></a>

MediaTailor place les publicités superposées dans `nonLinearAdsList` le catalogue. L'API de suivi MediaTailor côté client possède deux objets racines, appelés `avails` et. `nonLinearAvails` Si la réponse VAST est un VMAP avec ou `breakType``nonlinear`, les métadonnées Avail se trouvent dans l'objet `nonLinearAvails` racine. Si la réponse VAST est une réponse VMAP avec un `breakType` de`linear`, ou une réponse VAST simple sans VMAP, les métadonnées Avail se trouvent dans l'`avails`objet racine.

Pour plus d'informations sur le suivi côté client, consultez. [Suivi des publicités côté client](ad-reporting-client-side.md)

L'exemple suivant montre une réponse VAST simple ou une réponse VMAP avec une `breakType` valeur de`linear`.

```
{
  "avails": [
    {
      "adBreakTrackingEvents": [
        {
          "beaconUrls": [
            "https://adserver.com/beacon=breakstartimpression"
          ],
          "eventType": "breakStart"
        },
        {
          "beaconUrls": [
            "https://adserver.com/beacon=breakendimpression"
          ],
          "eventType": "breakEnd"
        }
      ],
      "adMarkerDuration": null,
      "ads": [],
      "availId": "828",
      "availProgramDateTime": null,
      "duration": "PT0S",
      "durationInSeconds": 0,
      "meta": null,
      "nonLinearAdsList": [
        {
          "extensions": null,
          "nonLinearAdList": [
            {
              "adId": "",
              "adParameters": null,
              "adSystem": "2.0",
              "adTitle": "2",
              "apiFramework": null,
              "clickThrough": null,
              "clickTracking": null,
              "clickTrackingId": null,
              "creativeAdId": "",
              "creativeId": "18",
              "creativeSequence": "",
              "duration": null,
              "durationInSeconds": 0,
              "expandedHeight": null,
              "expandedWidth": null,
              "height": "360",
              "htmlResource": null,
              "iFrameResource": null,
              "maintainAspectRatio": false,
              "minSuggestedDuration": null,
              "scalable": false,
              "staticResource": "https://client-side-ads.com/tags/static/ctv-generic/overlay001.json?iv_geo_country%3DUS%26",
              "staticResourceCreativeType": "text/js_ref",
              "width": "640"
            }
          ],
          "trackingEvents": [
            {
              "beaconUrls": [
                "https://adserver.com/beacon=impression"
              ],
              "duration": null,
              "durationInSeconds": 0,
              "eventId": null,
              "eventProgramDateTime": null,
              "eventType": "impression",
              "startTime": null,
              "startTimeInSeconds": 0
            }
          ]
        }
      ],
      "startTime": "PT1M46.08S",
      "startTimeInSeconds": 106.08
    }
  ],
  "dashAvailabilityStartTime": null,
  "hlsAnchorMediaSequenceNumber": null,
  "nextToken": null,
  "nonLinearAvails": []
}
```

L'exemple suivant montre une réponse VMAP simple avec une `breakType` valeur de`nonlinear`.

```
{
  "avails": [],
  "dashAvailabilityStartTime": null,
  "hlsAnchorMediaSequenceNumber": null,
  "nextToken": null,
  "nonLinearAvails": [
    {
      "adBreakTrackingEvents": [
        {
          "beaconUrls": [
            "https://adserver.com/beacon=breakstartimpression"
          ],
          "eventType": "breakStart"
        },
        {
          "beaconUrls": [
            "https://adserver.com/beacon=breakendimpression"
          ],
          "eventType": "breakEnd"
        }
      ],
      "adMarkerDuration": null,
      "ads": [],
      "availId": "828",
      "availProgramDateTime": null,
      "duration": "PT0S",
      "durationInSeconds": 0,
      "meta": null,
      "nonLinearAdsList": [
        {
          "extensions": null,
          "nonLinearAdList": [
            {
              "adId": "",
              "adParameters": null,
              "adSystem": "2.0",
              "adTitle": "2",
              "apiFramework": null,
              "clickThrough": null,
              "clickTracking": null,
              "clickTrackingId": null,
              "creativeAdId": "",
              "creativeId": "18",
              "creativeSequence": "",
              "duration": null,
              "durationInSeconds": 0,
              "expandedHeight": null,
              "expandedWidth": null,
              "height": "360",
              "htmlResource": null,
              "iFrameResource": null,
              "maintainAspectRatio": false,
              "minSuggestedDuration": null,
              "scalable": false,
              "staticResource": "https://client-side-ads.com/tags/static/ctv-generic/overlay001.json?iv_geo_country%3DUS%26",
              "staticResourceCreativeType": "text/js_ref",
              "width": "640"
            }
          ],
          "trackingEvents": [
            {
              "beaconUrls": [
                "https://adserver.com/beacon=impression"
              ],
              "duration": null,
              "durationInSeconds": 0,
              "eventId": null,
              "eventProgramDateTime": null,
              "eventType": "impression",
              "startTime": null,
              "startTimeInSeconds": 0
            }
          ]
        }
      ],
      "startTime": "PT1M46.08S",
      "startTimeInSeconds": 106.08
    }
  ]
}
```