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    <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-75439] Add metrics for preimage remover</title>
                <link>https://jira.mongodb.org/browse/SERVER-75439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the move to truncate markers we want to also keep track of the time spent performing truncation and the earliest wall time seen during truncation. This will help us detect possible issues with the system clock or clock shifts that prevent removal.&lt;/p&gt;

&lt;p&gt;The requirements for this are to record metrics similar in nature to change collection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c9a5f04d3c9a3e570afbe9a37b7f890319a618bd/src/mongo/db/change_stream_change_collection_manager.h#L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;metrics&lt;/a&gt;:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Total time spent removing&lt;/li&gt;
	&lt;li&gt;Total passes done&lt;/li&gt;
	&lt;li&gt;Bytes deleted&lt;/li&gt;
	&lt;li&gt;Docs deleted&lt;/li&gt;
	&lt;li&gt;Collections scanned&lt;/li&gt;
	&lt;li&gt;Max wall clock seen in the preimage collection&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For multi-tenant environments this will be an aggregation between all the tenants so that one pass equals a scan on every tenant.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2300751">SERVER-75439</key>
            <summary>Add metrics for preimage remover</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Mar 2023 13:02:41 +0000</created>
                <updated>Sun, 29 Oct 2023 21:24:03 +0000</updated>
                            <resolved>Thu, 13 Apr 2023 14:35:47 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5344417" author="xgen-internal-githook" created="Thu, 13 Apr 2023 14:21:49 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75439&quot; title=&quot;Add metrics for preimage remover&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75439&quot;&gt;&lt;del&gt;SERVER-75439&lt;/del&gt;&lt;/a&gt; Add pre-image remover metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d593c4224e75133128bf884da5580df2ae197697&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d593c4224e75133128bf884da5580df2ae197697&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2313900">COMPASS-6722</issuekey>
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            <issuelink>
            <issuekey id="2313903">TOOLS-3287</issuekey>
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            <issuekey id="2313899">DOCS-16039</issuekey>
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                            <customfieldvalue>Added a new set of serverStatus metrics related to the pre-images remover/purging job.&lt;br/&gt;
&lt;br/&gt;
We&amp;#39;ve added a field {{changeStreamPreImages.purgingJob}} that contains the following attributes:&lt;br/&gt;
&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* totalPass: Total number of deletion passes completed by the purging job.&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* docsDeleted: Cumulative number of pre-image documents deleted by the purging job&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* bytesDeleted: Cumulative size in bytes of all deleted documents from all pre-image collections by the purging job.&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* scannedCollections: Cumulative number of pre-image collections scanned by the purging job. In single-tenant environments this is the same as totalPass as there is 1 pre-image collection per tenant.&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* scannedInternalCollections: Cumulative number of internal pre-image collections scanned by the purging job. Internal collections are the segments of actual pre-images of collections within system.preimages.&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* maxStartWallTimeMillis: Maximum wall time from the first document of each pre-image collection.&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;* timeElapsedMillis: Cumulative number of milliseconds elapsed since the first pass by the purging job.</customfieldvalue>

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