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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-55187] Support secondary TTL indexes on time-series collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-55187</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Ensure that secondary TTL indexes work on time-series collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1648894">SERVER-55187</key>
            <summary>Support secondary TTL indexes on time-series collections</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
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                        <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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
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                <created>Mon, 15 Mar 2021 13:54:55 +0000</created>
                <updated>Tue, 6 Dec 2022 01:31:06 +0000</updated>
                            <resolved>Tue, 3 Aug 2021 20:07:37 +0000</resolved>
                                                                                        <votes>0</votes>
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                            <comment id="3978994" author="JIRAUSER1258161" created="Tue, 3 Aug 2021 20:07:14 +0000"  >&lt;p&gt;We discussed this further during the design phase for PM-2189, and decided to cut it from scope. Having a secondary TTL index on the measurements probably doesn&apos;t make a lot of sense. Removing individual measurements as they expire would be costly, so we would expire a bucket when all measurements in the bucket expired. It likely isn&apos;t a make-or-break feature for customers to be able to do this type of coarse-grained expiry based on a secondary timestamp field (not the primary timestamp field used in the time-series collection definition).&lt;/p&gt;</comment>
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