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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>[SERVER-80878] query stats store size serverStatus metric can go below 0</title>
                <link>https://jira.mongodb.org/browse/SERVER-80878</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;My in-progress patch for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79736&quot; title=&quot;Hash C++ data structures directly rather than building BSONObj&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79736&quot;&gt;&lt;del&gt;SERVER-79736&lt;/del&gt;&lt;/a&gt; reveals that making a copy of a QueryStatsEntry is permitted, and it will call the copy constructor which is compiler generated and will not increment the server status metric, but then it will eventually call the destructor which &lt;em&gt;will&lt;/em&gt; update the server status metric in the negative direction. So I think this means that if you invoke $queryStats we&apos;ll make copies of everything and decrement the counters. My patch makes it worse &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;It looks like the LRUKeyValue has a size tracker that could be customized to report metrics on its size, but it currently only exposes a customization option for the &apos;what is the size of this particular thing&apos; part of it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2436996">SERVER-80878</key>
            <summary>query stats store size serverStatus metric can go below 0</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="13201">Fixed</resolution>
                                        <assignee username="alyssa.clark@mongodb.com">Alyssa Clark</assignee>
                                    <reporter username="memento@mongodb.com">Memento Slack Bot</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Sep 2023 20:47:49 +0000</created>
                <updated>Tue, 31 Oct 2023 15:19:10 +0000</updated>
                            <resolved>Wed, 13 Sep 2023 21:53:55 +0000</resolved>
                                                    <fixVersion>7.1.1</fixVersion>
                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5842410" author="xgen-internal-githook" created="Tue, 31 Oct 2023 15:02:19 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alyssa Wagenmaker&apos;, &apos;email&apos;: &apos;alyssa.wagenmaker@mongodb.com&apos;, &apos;username&apos;: &apos;awagenmaker&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80878&quot; title=&quot;query stats store size serverStatus metric can go below 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80878&quot;&gt;&lt;del&gt;SERVER-80878&lt;/del&gt;&lt;/a&gt; Add QueryStatsStore insertion/eviction listener to track size&lt;br/&gt;
Branch: v7.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eb55125b8dd46516b4b4cf827c6b38968252e742&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eb55125b8dd46516b4b4cf827c6b38968252e742&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5702557" author="xgen-internal-githook" created="Wed, 13 Sep 2023 21:41:14 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alyssa Wagenmaker&apos;, &apos;email&apos;: &apos;alyssa.wagenmaker@mongodb.com&apos;, &apos;username&apos;: &apos;awagenmaker&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80878&quot; title=&quot;query stats store size serverStatus metric can go below 0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80878&quot;&gt;&lt;del&gt;SERVER-80878&lt;/del&gt;&lt;/a&gt; Add QueryStatsStore insertion/eviction listener to track size&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b9235dbace065846cc17937201c8eac9582bfd98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b9235dbace065846cc17937201c8eac9582bfd98&lt;/a&gt;&lt;/p&gt;</comment>
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