# `OpenRtbEcto.V3.BidRequest.Metric`
[🔗](https://github.com/AppMonet/open_rtb_ecto/blob/v1.4.6/lib/open_rtb_ecto/v3/bid_request/metric.ex#L1)

This object is associated with an item as an array of metrics. These metrics can offer insight to assist with decisioning such as average recent viewability, click-through rate, etc.  Each metric is identified by its type, reports the value of the metric, and optionally identifies the source or vendor measuring the value.

<table>
  <tr>
    <td><strong>Attribute&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</strong></td>
    <td><strong>Type&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</strong></td>
    <td><strong>Definition</strong></td>
  </tr>
  <tr>
    <td><code>type</code></td>
    <td>string; required</td>
    <td>Type of metric being presented using exchange curated string names which should be published to bidders <em>a priori</em>.</td>
  </tr>
  <tr>
    <td><code>value</code></td>
    <td>float; required</td>
    <td>Number representing the value of the metric.  Probabilities must be in the range 0.0 – 1.0.</td>
  </tr>
  <tr>
    <td><code>vendor</code></td>
    <td>string; recommended</td>
    <td>Source of the value using exchange curated string names which should be published to bidders <em>a priori</em>.  If the exchange itself is the source versus a third party, “EXCHANGE” is recommended.</td>
  </tr>
  <tr>
    <td><code>ext</code></td>
    <td>object</td>
    <td>Optional exchange-specific extensions.</td>
  </tr>
</table>

# `changeset`

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*Consult [api-reference.md](api-reference.md) for complete listing*