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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-16295] Investigate changes in SERVER-77909: Explore adding $collStats FTDC data for system.preimages</title>
                <link>https://jira.mongodb.org/browse/DOCS-16295</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    The &apos;changeStreamPreImages&apos; serverStatus section has additional statistics in a single-tenant enviornment. &lt;/p&gt;

&lt;p&gt;numDocs: &amp;lt;int&amp;gt; // same as $collStats.count&lt;br/&gt;
totalBytes: &amp;lt;int&amp;gt; // same as $collStats.size&lt;br/&gt;
avgDocSize: &amp;lt;int&amp;gt; // same as $collStats.avgObjSize (like collstats, only included when numDocs is non-zero)&lt;br/&gt;
storageSize: &amp;lt;int&amp;gt; // same as $collStats.storageSize&lt;br/&gt;
freeStorageSize: &amp;lt;int&amp;gt; // same as $collStats.freeStorageSize&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    As part of the technical discussion for the truncate refactor of preimages removal, we discovered that currently there&apos;s potentially no good way of detecting storage issues with preimages.&lt;/p&gt;

&lt;p&gt;To be symmettrical with the oplog, we should explore adding &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5f97bdf2b3b2cbf2fd817fc92ea3bc60cc845582/src/mongo/db/ftdc/ftdc_mongod.cpp#L117&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;$collStats&lt;/a&gt; for preimages in single tenant environments. That way we&apos;ll be able to more easily diagnose issues with the collection.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2406999">DOCS-16295</key>
            <summary>Investigate changes in SERVER-77909: Explore adding $collStats FTDC data for system.preimages</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Aug 2023 12:07:46 +0000</created>
                <updated>Mon, 13 Nov 2023 17:30:27 +0000</updated>
                            <resolved>Wed, 2 Aug 2023 22:51:41 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5609063" author="JIRAUSER1264463" created="Wed, 2 Aug 2023 22:51:28 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kateryna.kamenieva%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kateryna.kamenieva@mongodb.com&quot;&gt;kateryna.kamenieva@mongodb.com&lt;/a&gt;. Will do.&lt;/p&gt;</comment>
                            <comment id="5608612" author="kateryna.kamenieva" created="Wed, 2 Aug 2023 19:35:23 +0000"  >&lt;p&gt;ah, looks like docs were done for this here &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-16039&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/DOCS-16039&lt;/a&gt;&lt;br/&gt;
I think his ticket can be closed&lt;/p&gt;</comment>
                            <comment id="5608602" author="kateryna.kamenieva" created="Wed, 2 Aug 2023 19:32:13 +0000"  >&lt;p&gt;There are no plans for documenting PM-3092 as a user-facing feature, but looks like  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77909&quot; title=&quot;Explore adding $collStats FTDC data for system.preimages&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77909&quot;&gt;&lt;del&gt;SERVER-77909&lt;/del&gt;&lt;/a&gt; added new metrics to serverStatus, and we  the output of serverStatus, e.g. here &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/command/serverStatus/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/command/serverStatus/&lt;/a&gt; , so we can add this new section to that page at least&lt;/p&gt;</comment>
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                            <customfieldvalue>The &amp;#39;changeStreamPreImages&amp;#39; serverStatus section has additional statistics in a single-tenant enviornment. &lt;br/&gt;
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numDocs: &amp;lt;int&amp;gt; // same as $collStats.count&lt;br/&gt;
totalBytes: &amp;lt;int&amp;gt; // same as $collStats.size&lt;br/&gt;
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