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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-72363] Consider removing CollectionStatistics::addHistogram method</title>
                <link>https://jira.mongodb.org/browse/SERVER-72363</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A &lt;tt&gt;CollectionStatistics&lt;/tt&gt; is not concerned about the source of histograms. E.g., &lt;tt&gt;CollectionStatisticsImpl&lt;/tt&gt; should get its data from from the stats cache that is accessed when &lt;tt&gt;CollectionStatisticsImpl::getHistogram&lt;/tt&gt; is called. While &lt;tt&gt;CollectionStatisticsMock&lt;/tt&gt; used it tests should provide a more flexible interface to return custom histograms.&lt;/p&gt;

&lt;p&gt;That said, it seem that &lt;tt&gt;CollectionStatistics::addHistogram&lt;/tt&gt; should not be part of the &lt;tt&gt;CollectionStatistics&lt;/tt&gt; interface and we may consider removing it.&lt;/p&gt;

&lt;p&gt;To facilitate testing the &lt;tt&gt;addHistogram&lt;/tt&gt; method can be kept in the &lt;tt&gt;CollectionStatisticsMock&lt;/tt&gt; class.&lt;/p&gt;

&lt;p&gt;Another idea proposed by Misha would be changing &lt;tt&gt;addHistogram&lt;/tt&gt; to a private &lt;tt&gt;_addHistogram&lt;/tt&gt; and adding &lt;tt&gt;addHistogramForTest&lt;/tt&gt; to clarify that this API is only for testing.&lt;/p&gt;

&lt;p&gt;In addition, currently when &lt;tt&gt;addHistogram&lt;/tt&gt; is called providing a path for which a histogram already exists, we silently replace the old entry. If this behaviour is fine, we may consider changing the name to &lt;tt&gt;addOrReplaceHistogram&lt;/tt&gt;, or otherwise raise an error.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2217636">SERVER-72363</key>
            <summary>Consider removing CollectionStatistics::addHistogram method</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="misha.tyulenev@mongodb.com">Misha Tyulenev</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Dec 2022 11:42:27 +0000</created>
                <updated>Thu, 19 Jan 2023 19:14:56 +0000</updated>
                            <resolved>Thu, 19 Jan 2023 19:14:56 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5124998" author="misha.tyulenev" created="Thu, 19 Jan 2023 19:14:56 +0000"  >&lt;p&gt;There are unit tests that depend on the CollectionStatistics&#160; interface - namely histogram_estimator_test and benchmark_test. Removing the addHistogram will force the tests use CollectionStatisticsMock instead&lt;/p&gt;</comment>
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