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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>[SERVER-23272] Remove misleading/not useful diagnostic metrics</title>
                <link>https://jira.mongodb.org/browse/SERVER-23272</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;b&gt;keyUpdates&lt;/b&gt;: This metric tracks the # of index entries added on the update path. It does not track index changes due to upsert, removal of index entries or for write operations other than update. It also is not tracked for updates that cause document move (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23081&quot; title=&quot;keyUpdates not set on MMAPv1 document move&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23081&quot;&gt;&lt;del&gt;SERVER-23081&lt;/del&gt;&lt;/a&gt;).  A feature request (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23271&quot; title=&quot;Add metrics to track index key additions and deletions for all CRUD ops/commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23271&quot;&gt;&lt;del&gt;SERVER-23271&lt;/del&gt;&lt;/a&gt;) has been filed to add more comprehensive metrics, covering all write operations/commands for each of insert/update/delete.&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;fastmod&lt;/b&gt;: Tracks update operations under MMAPv1 that: a) Do not cause update of index keys. b) Are non-destructive updates. c) Do not result in document move (which we also track via the &apos;nmoved&apos; metric).  This behavior is hard to understand and of limited use when troubleshooting operation performance.&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;fastmodinsert&lt;/b&gt;: Tracks update operations that result in an insert, given the update is structured as a document replacement, rather than modification. This metric has not been considered useful in troubleshooting operation performance.&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;idhack&lt;/b&gt;: Use of idhack is reported in the planSummary. There is no need to track independently, once planSummary is universally reported under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23259&quot; title=&quot;Report planSummary in per-operation diagnostic log message and profiler for all relevant ops/commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23259&quot;&gt;&lt;del&gt;SERVER-23259&lt;/del&gt;&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;moved&lt;/b&gt;: Boolean value indicating whether an MMAPv1 document has moved on disk. This metric has been obsolete since the introduction of &lt;b&gt;nmoved&lt;/b&gt;, whose presence and value of 1 or more indicates &apos;moved&apos;.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="274061">SERVER-23272</key>
            <summary>Remove misleading/not useful diagnostic metrics</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="9">Done</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Mar 2016 19:20:42 +0000</created>
                <updated>Fri, 17 May 2019 13:43:43 +0000</updated>
                            <resolved>Wed, 27 Apr 2016 15:50:17 +0000</resolved>
                                                    <fixVersion>3.3.6</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1247929" author="xgen-internal-githook" created="Wed, 27 Apr 2016 15:33:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23272&quot; title=&quot;Remove misleading/not useful diagnostic metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23272&quot;&gt;&lt;del&gt;SERVER-23272&lt;/del&gt;&lt;/a&gt; Remove idhack metric&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c0822ee332921f77d9a3466d23cf3f75ab80cf4d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c0822ee332921f77d9a3466d23cf3f75ab80cf4d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1247909" author="xgen-internal-githook" created="Wed, 27 Apr 2016 15:19:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23272&quot; title=&quot;Remove misleading/not useful diagnostic metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23272&quot;&gt;&lt;del&gt;SERVER-23272&lt;/del&gt;&lt;/a&gt; Deprecate idhack metric in SNMP&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/d05e5a64e4a4ac30710aeb84fd315b88ea2197e2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/d05e5a64e4a4ac30710aeb84fd315b88ea2197e2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1245470" author="james.wahlin@10gen.com" created="Mon, 25 Apr 2016 15:29:07 +0000"  >&lt;p&gt;Work remaining on this ticket:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Remove idhack metric (dependent on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23259&quot; title=&quot;Report planSummary in per-operation diagnostic log message and profiler for all relevant ops/commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23259&quot;&gt;&lt;del&gt;SERVER-23259&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;Enter DOCS ticket to remove &apos;keyUpdates&apos;, &apos;fastmod&apos;, &apos;idhack&apos; and &apos;moved&apos; metrics from our documentation for 3.4.&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="1245468" author="xgen-internal-githook" created="Mon, 25 Apr 2016 15:28:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23272&quot; title=&quot;Remove misleading/not useful diagnostic metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23272&quot;&gt;&lt;del&gt;SERVER-23272&lt;/del&gt;&lt;/a&gt; Remove &apos;keyUpdates&apos;, &apos;fastmod&apos; and &apos;moved&apos; metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/85f3d108a95e4286fe03e517a586ce9f34d12d53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/85f3d108a95e4286fe03e517a586ce9f34d12d53&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1245432" author="xgen-internal-githook" created="Mon, 25 Apr 2016 15:12:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23272&quot; title=&quot;Remove misleading/not useful diagnostic metrics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23272&quot;&gt;&lt;del&gt;SERVER-23272&lt;/del&gt;&lt;/a&gt; Deprecate &apos;fastmod&apos; metric in SNMP&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/1a968169d725110d8174b5323327aafae217d6ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/1a968169d725110d8174b5323327aafae217d6ce&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1241602" author="james.wahlin@10gen.com" created="Wed, 20 Apr 2016 18:34:15 +0000"  >&lt;p&gt;Created &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23831&quot; title=&quot;Remove the &amp;#39;fastmodinsert&amp;#39; metric &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23831&quot;&gt;&lt;del&gt;SERVER-23831&lt;/del&gt;&lt;/a&gt; to consider removal of &apos;fastmodinsert&apos; post MongoDB 3.4 release and general adoption.&lt;/p&gt;</comment>
                            <comment id="1241532" author="james.wahlin@10gen.com" created="Wed, 20 Apr 2016 17:48:42 +0000"  >&lt;p&gt;We are adding removal of the &apos;moved&apos; metric to the scope of this ticket. &apos;moved&apos; has been obsolete since the introduction of &apos;nmoved&apos;.&lt;/p&gt;</comment>
                            <comment id="1241360" author="james.wahlin@10gen.com" created="Wed, 20 Apr 2016 15:49:13 +0000"  >&lt;p&gt;Created &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-7697&quot; title=&quot;Deprecate &amp;#39;fastmodinsert&amp;#39; metric for MongoDB 3.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-7697&quot;&gt;&lt;del&gt;DOCS-7697&lt;/del&gt;&lt;/a&gt; to request deprecation of &apos;fastmodinsert&apos; in MongoDB 3.4&lt;/p&gt;</comment>
                            <comment id="1231977" author="james.wahlin@10gen.com" created="Mon, 11 Apr 2016 15:19:43 +0000"  >&lt;p&gt;As part of our work on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23271&quot; title=&quot;Add metrics to track index key additions and deletions for all CRUD ops/commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23271&quot;&gt;&lt;del&gt;SERVER-23271&lt;/del&gt;&lt;/a&gt;, we found a bug regarding the keyUpdates metric. We zero out this metric on call to Collection::updateDocument. This serves its purpose when updating a single document, but when performing a multi-update, only the last document updated will be reflected. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23635&quot; title=&quot;The &amp;#39;keyUpdates&amp;#39; metric only reflects the last document updated when performing a multi-update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23635&quot;&gt;&lt;del&gt;SERVER-23635&lt;/del&gt;&lt;/a&gt; entered to track.&lt;/p&gt;

&lt;p&gt;We won&apos;t fix keyUpdates for 3.4 as we plan to remove under this ticket. Backport to 3.0 and 3.2 should be considered.&lt;/p&gt;</comment>
                            <comment id="1215681" author="james.wahlin@10gen.com" created="Fri, 25 Mar 2016 18:50:10 +0000"  >&lt;p&gt;After discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=scotthernandez&quot; class=&quot;user-hover&quot; rel=&quot;scotthernandez&quot;&gt;scotthernandez&lt;/a&gt; &amp;amp; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jason.rassi&quot; class=&quot;user-hover&quot; rel=&quot;jason.rassi&quot;&gt;jason.rassi&lt;/a&gt;, our current thoughts are to:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Remove keyUpdates and fastmod, with a dependency on creation of a new &quot;keysAffected&quot; metric (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23271&quot; title=&quot;Add metrics to track index key additions and deletions for all CRUD ops/commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23271&quot;&gt;&lt;del&gt;SERVER-23271&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
	&lt;li&gt;Deprecate fastmodinsert for 3.4, and enter a separate ticket for future removal. Feedback received during the deprecation period will help determine whether a) We should remove outright  b) We should replace with a better metric - potentially something that is meaningful for all storage engines or c) We should leave in place as-is.&lt;/li&gt;
	&lt;li&gt;Remove idhack, with a dependency on adding planSummary for all relevant operations (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23259&quot; title=&quot;Report planSummary in per-operation diagnostic log message and profiler for all relevant ops/commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23259&quot;&gt;&lt;del&gt;SERVER-23259&lt;/del&gt;&lt;/a&gt;)&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="1210118" author="scotthernandez" created="Mon, 21 Mar 2016 19:35:00 +0000"  >&lt;p&gt;Not sure about &quot;fastmod&quot; not being useful. Also, keyUpdates has been very useful in the past and we should not remove it until we better functionality.&lt;/p&gt;

&lt;p&gt;While removing these might clean code up I&apos;d be concerned that we need to replace/improve reporting first, before removing.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
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            <issuelink>
            <issuekey id="274060">SERVER-23271</issuekey>
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                                        <issuelink>
            <issuekey id="58906">SERVER-7897</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="278836">SERVER-23635</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="271774">SERVER-23081</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="281107">DOCS-7697</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="282793">DOCS-7761</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="281188">SERVER-23831</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="281560">SERVER-23861</issuekey>
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