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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>[COMPASS-7423] Investigate changes in PM-3268: Add data-bearing node metrics to query shape stats</title>
                <link>https://jira.mongodb.org/browse/COMPASS-7423</link>
                <project id="13182" key="COMPASS">Compass </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 class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    The $queryStats aggregation stage will expose new metrics for keysExamined and others. No changes will be made to existing metrics returned.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #e3fcf7;border-color: #00684a;border-style: solid;border-width: 2px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 2px;border-bottom-style: solid;border-bottom-color: #00684a;background-color: #00684a;color: #fff;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Add support for telemetry metrics like &apos;keysExamined&apos; which must be collected on nodes that execute queries against the storage layer.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;Query execution metrics like number of index keys scanned are important for understanding query performance and index quality for a given workload. These metrics can only be measured on the data-bearing nodes where a query is executed against the storage layer.&lt;/p&gt;

&lt;p&gt;In replica sets and single-shard deployments, these metrics could be collected identically to the router metrics that were added in PM-2885. In more complex multi-shard topologies, however, there needs to be a way to correlate router-collected metrics with data node-collected metrics for a given user query that is resilient to node restarts.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;https://docs.google.com/document/d/11lIOP8NZjxtsfeAtfs-Q991Jp3_iqo9JQuDJmWyNONM/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1mTNfQx8U1XfTLQm8G21JVfMp2xnHyQ42xmd5H1MYckE/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1TuQZ1kERNHAQ-nS3kTrNAw6AxwkXnBQHoUeMNuJzX84/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/document/d/1RUXGmtV70hVdWSBfCM34bT6XXASy0aJMnBL7DGc_r1Y/edit?usp=drivesdk&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Docs Update&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="2493238">COMPASS-7423</key>
            <summary>Investigate changes in PM-3268: Add data-bearing node metrics to query shape stats</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Nov 2023 20:01:43 +0000</created>
                <updated>Tue, 6 Feb 2024 20:00:38 +0000</updated>
                            <resolved>Fri, 19 Jan 2024 14:09:34 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="6072820" author="dbeng-pm-bot" created="Tue, 6 Feb 2024 20:00:38 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3268:&lt;/em&gt; &lt;br/&gt;
8.0 Targeted&lt;/p&gt;</comment>
                            <comment id="6062823" author="dbeng-pm-bot" created="Fri, 2 Feb 2024 16:18:45 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3268:&lt;/em&gt; &lt;br/&gt;
8.1 Targeted&lt;/p&gt;</comment>
                            <comment id="6025566" author="JIRAUSER1256529" created="Fri, 19 Jan 2024 14:09:34 +0000"  >&lt;p&gt;No impact&lt;/p&gt;</comment>
                            <comment id="5879877" author="dbeng-pm-bot" created="Tue, 14 Nov 2023 19:17:49 +0000"  >&lt;p&gt;&lt;em&gt;Fix Version updated for upstream PM-3268:&lt;/em&gt; &lt;br/&gt;
8.0 Targeted&lt;/p&gt;</comment>
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