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<p>Data Source Metadata queries return metadata information for a dataSource.  These queries return information about:</p>
<ul>
<li>The timestamp of latest ingested event for the dataSource. This is the ingested event without any consideration of rollup.</li>
</ul>
<p>The grammar for these queries is:</p>
<pre><code class="hljs css language-json">{
    <span class="hljs-attr">"queryType"</span> : <span class="hljs-string">"dataSourceMetadata"</span>,
    <span class="hljs-attr">"dataSource"</span>: <span class="hljs-string">"sample_datasource"</span>
}
</code></pre>
<p>There are 2 main parts to a Data Source Metadata query:</p>
<table>
<thead>
<tr><th>property</th><th>description</th><th>required?</th></tr>
</thead>
<tbody>
<tr><td>queryType</td><td>This String should always be &quot;dataSourceMetadata&quot;; this is the first thing Apache Druid (incubating) looks at to figure out how to interpret the query</td><td>yes</td></tr>
<tr><td>dataSource</td><td>A String or Object defining the data source to query, very similar to a table in a relational database. See <a href="/docs/latest/querying/datasource.html">DataSource</a> for more information.</td><td>yes</td></tr>
<tr><td>context</td><td>See <a href="/docs/latest/querying/query-context.html">Context</a></td><td>no</td></tr>
</tbody>
</table>
<p>The format of the result is:</p>
<pre><code class="hljs css language-json">[ {
  <span class="hljs-attr">"timestamp"</span> : <span class="hljs-string">"2013-05-09T18:24:00.000Z"</span>,
  <span class="hljs-attr">"result"</span> : {
    <span class="hljs-attr">"maxIngestedEventTime"</span> : <span class="hljs-string">"2013-05-09T18:24:09.007Z"</span>
  }
} ]
</code></pre>
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