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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>[SERVER-37031] The scanned and returned counts in server status should not include oplog queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-37031</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Other MongoDB products use the ratio or returned vs scanned to indicate healthy queries and good indexes. In certain cases, we alert&#160;end users if this ratio is too high (over 1000)&lt;/p&gt;

&lt;p&gt;However, since oplog&#160;queries are included in this global metric, change streams and the triggers built off change streams cause these alerts to happen much more frequently. Additionally, in the case of oplog&#160;queries, the ratio does not indicate a bad query and may just indicate a selective change stream. These alerts are not at all actionable in these cases.&lt;/p&gt;

&lt;p&gt;The solution is to remove oplog&#160;queries from the scanned and returned counts and add a new metric which includes the oplog&#160;queries.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="600627">SERVER-37031</key>
            <summary>The scanned and returned counts in server status should not include oplog queries</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="asya.kamsky@mongodb.com">Asya Kamsky</assignee>
                                    <reporter username="alyson.cabral@mongodb.com">Alyson Cabral</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Sep 2018 18:08:02 +0000</created>
                <updated>Thu, 13 Sep 2018 21:36:56 +0000</updated>
                            <resolved>Thu, 13 Sep 2018 21:35:44 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2002514" author="asya" created="Thu, 13 Sep 2018 21:35:44 +0000"  >&lt;p&gt;&amp;gt;&#160;ratio or returned vs scanned&lt;/p&gt;

&lt;p&gt;The numbers in db.serverStatus().metrics that I assume you refer to (in queryExecutor for scanned and scannedObjects) are instance-wide and accurately reflect number of documents and index entries examined.&lt;/p&gt;

&lt;p&gt;They should not be directly compared to the number&#160;in metrics.document.returned as this is a very unreliable &quot;proxy&quot; for healthy queries and good indexes.&#160; For example, any aggregation that returns &quot;count&quot; will return exactly one document but it may look at hundreds or thousands (or millions) of index entries and considerably skew the ratio, even though it&apos;s as efficient as it can possibly be.&lt;/p&gt;

&lt;p&gt;Oplog queries contribute to the overall load of the cluster so looking at more oplog entries &lt;b&gt;will&lt;/b&gt; negatively contribute to the overall load.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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