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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-38904] Long log lines truncate to less than maxLogSizeKB</title>
                <link>https://jira.mongodb.org/browse/SERVER-38904</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When log lines exceed maxLogSizeKB (10 KB by default), the truncation retains only the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/src/mongo/logger/message_event_utf8_encoder.cpp#L132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;first third of maxLogSizeKB&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.6/src/mongo/logger/message_event_utf8_encoder.cpp#L134&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;last third of maxLogSizeKB&lt;/a&gt; chars of the log message.&lt;/p&gt;

&lt;p&gt;This causes the resulting log line to be less than maxLogSizeKB (even though the value of maxLogSizeKB is reported in the line itself, in a way which suggests it has been truncated to this length), which is unexpected.  For example, for the default value (10 KB), only about 7 KB is retained from a 10.5 KB log line, whereas a 9.5 KB log line will retain all its info (no truncation).  Users might be surprised if they configure a custom value for maxLogSizeKB and then subsequently discover that less information has been retained.&lt;/p&gt;

&lt;p&gt;Probably the &lt;tt&gt;maxLogLine / 3&lt;/tt&gt; occurrences should be replaced by &lt;tt&gt;(maxLogLine - length_of_truncation_warning) / 2&lt;/tt&gt; (the length of the truncation warning is about 100 bytes).  Presumably the ~50 bytes for the timestamp, severity, component, and context, is not worth incorporating in the truncation length (since this is more about truncating the &lt;em&gt;actual message&lt;/em&gt;, not necessarily the entire line).&lt;/p&gt;</description>
                <environment></environment>
        <key id="668037">SERVER-38904</key>
            <summary>Long log lines truncate to less than maxLogSizeKB</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-devtools">DO NOT USE - Backlog - Dev Tools</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 9 Jan 2019 06:40:03 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:05 +0000</updated>
                            <resolved>Tue, 17 Mar 2020 12:04:48 +0000</resolved>
                                                                    <component>Logging</component>
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