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    <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-15700] Investigate changes in SERVER-65289: Improvements to Mirrored Reads Metrics and Visibility</title>
                <link>https://jira.mongodb.org/browse/DOCS-15700</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;    This ticket adds new serverStatus metrics for the mirrored reads section (&lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/command/serverStatus/#mirroredreads&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/#mirroredreads&lt;/a&gt;). &lt;/p&gt;

&lt;p&gt;The new user-facing field is mirroredReads.processedAsSecondary:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;the number of mirrored reads processed successfully by a secondary.
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Hi Team,&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Starting in v4.4 we introduced the &lt;a href=&quot;https://www.mongodb.com/docs/manual/replication/#mirrored-reads&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Mirrored Reads&lt;/a&gt; feature, and we have a couple of server metrics tracking that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;em&gt;ss mirroredReads seen&lt;/em&gt;: tracks the number of operations that can be mirrored (&quot;mirrorable&quot;).&lt;/li&gt;
	&lt;li&gt;&lt;em&gt;ss mirroredReads sent&lt;/em&gt;: tracks the numbe of &quot;mirrorable&quot; operations that were actually sent to Secondaries.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The problem is that there is no indication in the Secondaries&apos; Diagnostic Data or Logs of the amount of reads executed as a result of the Mirror Reads feature.&lt;/p&gt;

&lt;p&gt;For Troubleshooting purposes, it would be nice to have the following:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;When an instance is a Secondary and it receives mirrored reads, track them in the Diagnostic Data with a metric similar to &lt;em&gt;ss mirroredReads executed&lt;/em&gt;.&lt;/li&gt;
	&lt;li&gt;When an instance is a Secondary and it eventually logs a &quot;slow&quot; (as per &lt;em&gt;slowms&lt;/em&gt; threshold) mirrored read, add a field in the logs to clearly show the origin of this call like &quot;mirrored: true&quot;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;These changes should be very helpful when troubleshooting, and the suggested changes should be added to both v4.4 and v5.0.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2165929">DOCS-15700</key>
            <summary>Investigate changes in SERVER-65289: Improvements to Mirrored Reads Metrics and Visibility</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="kenneth.dyer@mongodb.com">Kenneth Dyer</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Oct 2022 20:55:56 +0000</created>
                <updated>Mon, 13 Nov 2023 17:37:43 +0000</updated>
                            <resolved>Wed, 22 Feb 2023 22:38:56 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
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