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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-49745] Subtle undocumented difference between LOGV2 and LOGV2_INFO.</title>
                <link>https://jira.mongodb.org/browse/SERVER-49745</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There&apos;s a subtlety that is disorienting, between LogSeverity::Log and LogSeverity::Info, because they appear identical in the log output, but they respond to verbosity filters as distinct severity levels.&#160; the `Log` severity is 0, and the `Info` severity is -1. These severities, though distinct internally, will both appear as an &quot;s&quot;:&quot;I&quot; in the log output.&lt;/p&gt;

&lt;p&gt;As a result, it&apos;s unclear to users when to use LOGV2_INFO and when to use the default LOGV2. Guidance and documentation on this severity folding behavior would helpful.&lt;/p&gt;

&lt;p&gt;=== Slack transcript (or approximation thereof) ===&lt;/p&gt;

&lt;p&gt;Billy Donahue Today at 2:23 PM&lt;br/&gt;
 no, you&apos;re off by one there &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;. The default is LogSeverity::Log, which is LogSeverity(0). LOGV2_INFO goes to LogSeverity::Info, which is LogSeverity(-1). (edited) &lt;br/&gt;
 14 replies&lt;/p&gt;

&lt;p&gt;louis.williams 31 minutes ago&lt;br/&gt;
 What is the difference in the log output?&lt;/p&gt;

&lt;p&gt;louis.williams 31 minutes ago&lt;br/&gt;
 Also, there isn&#8217;t any guidance when to use one or the other.&lt;/p&gt;

&lt;p&gt;The severity appears in the &quot;s&quot; key of the json output object.&lt;br/&gt;
 And I think you are right about the missing guidance. I looked around a bit and didn&apos;t find any.&lt;/p&gt;

&lt;p&gt;Just testing locally, the &#8220;s&#8221; field is &#8220;I&#8221; for both LOGV2 and LOGV2_INFO&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/logv2/log_severity.cpp#L69&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/logv2/log_severity.cpp#L69&lt;/a&gt; &amp;lt;=where the magic happens.&lt;/p&gt;

&lt;p&gt;I think it&apos;s definitely worth a ticket. That line in log_severity.cpp is very subtle and needs user-facing documentation.&lt;br/&gt;
 I think they&apos;re affected by verbosity filtering differently, even though they appear indistinguishable in the log.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1415043">SERVER-49745</key>
            <summary>Subtle undocumented difference between LOGV2 and LOGV2_INFO.</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-security">Backlog - Security Team</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Mon, 20 Jul 2020 19:09:05 +0000</created>
                <updated>Fri, 6 Jan 2023 13:35:57 +0000</updated>
                            <resolved>Mon, 19 Apr 2021 17:20:42 +0000</resolved>
                                                                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3315938" author="gabriel.russell" created="Fri, 31 Jul 2020 16:24:14 +0000"  >&lt;p&gt;FYI, this is not a difference new to logv2. This behavior is just carried over from the legacy logger.&lt;/p&gt;</comment>
                            <comment id="3293162" author="billy.donahue" created="Mon, 20 Jul 2020 19:09:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt;&#160;FYI&lt;/p&gt;</comment>
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