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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-8914] Document the $collStats aggregation source</title>
                <link>https://jira.mongodb.org/browse/DOCS-8914</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;tt&gt;$collStats&lt;/tt&gt; is a new aggregation source in MongoDB 3.4. It provides a superset of the information available via the &lt;tt&gt;db.collection.stats()&lt;/tt&gt; shell helper available in 3.2.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;$collStats&lt;/tt&gt; must be the first stage in a pipeline.&lt;/p&gt;

&lt;p&gt;Synopsis:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.collection.aggregate(&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    { $collStats: &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        latencyStats: &amp;lt;document&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        storageStats: {}&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Both &lt;tt&gt;latencyStats&lt;/tt&gt; and &lt;tt&gt;storageStats&lt;/tt&gt; are optional.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;storageStats&lt;/tt&gt; gives you storage-level statistics about a collection. It&apos;s exactly the same output as the old &lt;tt&gt;db.collection.stats()&lt;/tt&gt; shell helper. This can only be specified on a collection; attempting it on a view results in the error &lt;tt&gt;CommandNotSupportedOnView&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;latencyStats&lt;/tt&gt; gives information about latencies for reads, writes and commands on a given namespace. It can be run on both views and collections. The &lt;tt&gt;latencyStats&lt;/tt&gt; field must be a document that itself has one field, &lt;tt&gt;histograms&lt;/tt&gt;. If &lt;tt&gt;histograms&lt;/tt&gt; is &lt;tt&gt;true&lt;/tt&gt;, the command returns the full operation latency histograms for that namespace. If false, the full histogram is omitted and only a summary is output.&lt;/p&gt;

&lt;p&gt;*&lt;b&gt;Note from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=allison.moore%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;allison.moore@mongodb.com&quot;&gt;allison.moore@mongodb.com&lt;/a&gt;&lt;/b&gt;*: We&apos;ll need to a reference page for the new &lt;tt&gt;$collStats&lt;/tt&gt; pipeline operator.&lt;/p&gt;</description>
                <environment></environment>
        <key id="319553">DOCS-8914</key>
            <summary>Document the $collStats aggregation source</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="andrew.aldridge@mongodb.com">Andrew Aldridge</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Sep 2016 18:30:57 +0000</created>
                <updated>Wed, 2 Nov 2016 19:50:22 +0000</updated>
                            <resolved>Fri, 28 Oct 2016 15:54:32 +0000</resolved>
                                                    <fixVersion>3.4.0</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1420925" author="xgen-internal-githook" created="Fri, 28 Oct 2016 19:05:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;i80and&apos;, u&apos;name&apos;: u&apos;Andrew Aldridge&apos;, u&apos;email&apos;: u&apos;i80and@foxquill.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8914&quot; title=&quot;Document the $collStats aggregation source&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8914&quot;&gt;&lt;del&gt;DOCS-8914&lt;/del&gt;&lt;/a&gt;: Add $collStats aggregation operator&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/2622ce01ac809af62000b73593a6c66003c26b24&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/2622ce01ac809af62000b73593a6c66003c26b24&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="300364">DOCS-8263</issuekey>
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            <issuekey id="296321">DOCS-8165</issuekey>
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