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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-84467] Add duration of how long an oplog slot is kept open to FTDC</title>
                <link>https://jira.mongodb.org/browse/SERVER-84467</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While observing a high lastDurable lag for (HELP-53772), we were uncertain whether it resulted from an oplog hole or if the calculation of lastDurable was simply taking more time due to an increased number of sessions. Having this information would have been more helpful in eliminating the first possibility.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2534841">SERVER-84467</key>
            <summary>Add duration of how long an oplog slot is kept open to FTDC</summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="m.maher@mongodb.com">Moustafa Maher</reporter>
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                            <label>repl-shortlist</label>
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                <created>Tue, 2 Jan 2024 02:01:54 +0000</created>
                <updated>Mon, 8 Jan 2024 19:11:26 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5981056" author="lingzhi.deng" created="Tue, 2 Jan 2024 20:01:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70155&quot; title=&quot;Add duration of how long an oplog slot is kept open to mongod &amp;quot;Slow query&amp;quot; log lines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70155&quot;&gt;&lt;del&gt;SERVER-70155&lt;/del&gt;&lt;/a&gt; added a new metric &quot;totalOplogSlotDurationMicros&quot; in slow query messages. Would that be helpful here? Additionally, newer version of t2 has &quot;oplog wt visibility lag&quot; which is calculated as the gap between the timestamp of the latest oplog entry and the timestamp of the visibility point. But note that this is not exactly how long an oplog slot has been kept open. If no new oplog entry being written (i.e. latest oplog entry not changing), &quot;oplog wt visibility lag&quot; shown in t2 could be a constant. Would &quot;totalOplogSlotDurationMicros&quot; in slow query and &quot;oplog wt visibility lag&quot; in t2 together be sufficient?&lt;/p&gt;</comment>
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