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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-12740] Docs for SERVER-41192: Add a metric for the size of the SessionCatalog under `logicalSessionRecordCache`</title>
                <link>https://jira.mongodb.org/browse/DOCS-12740</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;Please add documentation for this new metric called &lt;tt&gt;sessionCatalogSize&lt;/tt&gt;, which will start showing-up under the LogicalSessionCache stats.&lt;/p&gt;

&lt;p&gt;Description is:&lt;br/&gt;
The session catalog is an in-memory cache of the config.transactions collection on MongoD and on routers (starting in 4.2) it represents the number of cross-shard transactions, which are rooted on that MongoS. This metric represents the number of entries in the in-memory cache and is a way to monitor that sessions are reaped and not kept alive indefinitely.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;The &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/serverStatus/#logicalsessionrecordcache&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;logicalSessionRecordCache&lt;/tt&gt;&lt;/a&gt; section of &lt;tt&gt;serverStatus&lt;/tt&gt; contains details about the entries in the logical session cache. This cache serves as a source of &apos;truth&apos; for which logical sessions are considered active or not and is used to reap the SessionCatalog.&lt;/p&gt;

&lt;p&gt;However, since the SessionCatalog is linked to the internal state of transactions - it can not always be reaped when a session expires from the logical sessions cache. Because of this, for diagnostics purposes we should have FTDC data for what&apos;s the number of sessions in the SessionCatalog.&lt;/p&gt;

&lt;p&gt;This ticket is to add a &lt;tt&gt;logicalSessionRecordCache.sessionCatalogSize&lt;/tt&gt; metric, which tracks the number of the SessionCatalog entries.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="774773">DOCS-12740</key>
            <summary>Docs for SERVER-41192: Add a metric for the size of the SessionCatalog under `logicalSessionRecordCache`</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 May 2019 19:07:48 +0000</created>
                <updated>Mon, 13 Nov 2023 18:20:47 +0000</updated>
                            <resolved>Tue, 9 Jul 2019 14:22:04 +0000</resolved>
                                                    <fixVersion>4.1.12</fixVersion>
                    <fixVersion>4.0.22</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>1</watches>
                                                                                                                <comments>
                            <comment id="3561343" author="xgen-internal-githook" created="Tue, 12 Jan 2021 21:56:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13944&quot; title=&quot;[BACKPORT] [v4.0] Add a metric for the size of the SessionCatalog under `logicalSessionRecordCache`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13944&quot;&gt;&lt;del&gt;DOCS-13944&lt;/del&gt;&lt;/a&gt; Backport &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12740&quot; title=&quot;Docs for SERVER-41192: Add a metric for the size of the SessionCatalog under `logicalSessionRecordCache`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12740&quot;&gt;&lt;del&gt;DOCS-12740&lt;/del&gt;&lt;/a&gt; to 4.0: logicalSessionRecordCache.sessionCatalogSize&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/20c2a3de4c535917c257275af4cd1facf45782e7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/20c2a3de4c535917c257275af4cd1facf45782e7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2316855" author="xgen-internal-githook" created="Tue, 9 Jul 2019 14:21:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12740&quot; title=&quot;Docs for SERVER-41192: Add a metric for the size of the SessionCatalog under `logicalSessionRecordCache`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12740&quot;&gt;&lt;del&gt;DOCS-12740&lt;/del&gt;&lt;/a&gt;: 4.2 logicalSessionRecordCache.sessionCatalogSize&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/bd747d31a75a5334d8612d057675a694e31501d2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/bd747d31a75a5334d8612d057675a694e31501d2&lt;/a&gt;&lt;/p&gt;</comment>
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