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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68442] Make mongos capture read/write latency for a collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-68442</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongod captures the latency metrics of reads and writes to a collection and exposes them via $collStats. However, mongos doesn&apos;t do that. Running $collStats against a mongos returns the latencyStats for each shard in a separate document along with the other stats. Similar to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46478&quot; title=&quot;Add opLatencies to mongoS serverStatus&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46478&quot;&gt;&lt;del&gt;SERVER-46478&lt;/del&gt;&lt;/a&gt;, we should make mongos capture per-collection latency metrics to allow for performance analysis after (re)sharding and other cases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2102895">SERVER-68442</key>
            <summary>Make mongos capture read/write latency for a collection</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="garaudy.etienne@mongodb.com">Garaudy Etienne</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Fri, 29 Jul 2022 22:24:20 +0000</created>
                <updated>Wed, 9 Nov 2022 12:25:39 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4893936" author="garaudy.etienne" created="Tue, 11 Oct 2022 12:42:42 +0000"  >&lt;p&gt;From Cailin: &quot;I spent several hours today failing to notice that one mongos (out of 36) in a sharded cluster was unhealthy and causing substantial application slowness. Given the metrics available, the only metric that did indicate &quot;unhealthy&quot; was virtual memory. But... I didn&apos;t think to look at virtual memory for all 36 mongos. If there had been opLatency metrics available for the mongos, I feel confident I would have figured this out sooner.&quot;&lt;/p&gt;</comment>
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