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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>[DOCS-2398] Improve FAQ for Monitoring Agent Robustness</title>
                <link>https://jira.mongodb.org/browse/DOCS-2398</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Mongo: &quot;The Monitoring agent is fairly robust, and MMS automatically sends an Agent Down alert when a Monitoring agent becomes unavailable. For most applications, a single Monitoring agent is sufficient. However, you can choose to run a second agent to provide redundancy. Larger numbers of agents do not provide significant benefit. See: Monitoring Architecture for information.&quot;&lt;/p&gt;

&lt;p&gt;So we had these guys running a single agent that went down during Black Friday and their system went sideways.  We had no time series data view into why their system failed.&lt;br/&gt;
We can recommend agent, you might be able to do it, but we need to recommend two.  Even if the agent is perfect, machines fail, and usually under heavy load when you can least afford to miss monitoring stats.&lt;/p&gt;</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://mms.mongodb.com/help/monitoring/faq/#should-i-run-more-than-one-agent&quot;&gt;http://mms.mongodb.com/help/monitoring/faq/#should-i-run-more-than-one-agent&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:25.0) Gecko/20100101 Firefox/25.0&lt;br/&gt;
*Screen Resolution*: 1440 x 900&lt;br/&gt;
*repo*: REPONAME&lt;br/&gt;
*source*: monitoring/faq&lt;br/&gt;
</environment>
        <key id="101925">DOCS-2398</key>
            <summary>Improve FAQ for Monitoring Agent Robustness</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="9">Done</resolution>
                                        <assignee username="tim.slavin">Tim Slavin</assignee>
                                    <reporter username="charlie.page@10gen.com">Charlie Page</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Wed, 11 Dec 2013 19:11:04 +0000</created>
                <updated>Fri, 3 Nov 2017 11:23:48 +0000</updated>
                            <resolved>Tue, 24 Dec 2013 14:52:51 +0000</resolved>
                                                    <fixVersion>01112017-cleanup</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="474682" author="xgen-internal-githook" created="Tue, 24 Dec 2013 14:29:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;Tim Slavin&apos;, u&apos;email&apos;: u&apos;TimSlavin@MongoDBs-MacBook-Pro-2.local&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2398&quot; title=&quot;Improve FAQ for Monitoring Agent Robustness&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2398&quot;&gt;&lt;del&gt;DOCS-2398&lt;/del&gt;&lt;/a&gt; multiple agents Edit 4&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/d6fbb3294d0b6fb51b928617eaaf55afb9a964ba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/d6fbb3294d0b6fb51b928617eaaf55afb9a964ba&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="474681" author="xgen-internal-githook" created="Tue, 24 Dec 2013 14:29:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;Tim Slavin&apos;, u&apos;email&apos;: u&apos;TimSlavin@MongoDBs-MacBook-Pro-2.local&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2398&quot; title=&quot;Improve FAQ for Monitoring Agent Robustness&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2398&quot;&gt;&lt;del&gt;DOCS-2398&lt;/del&gt;&lt;/a&gt; multiple agents Edit 3&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/fd8e6e8a2ace5813b9ef362b9f6c6186659ed815&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/fd8e6e8a2ace5813b9ef362b9f6c6186659ed815&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="474680" author="xgen-internal-githook" created="Tue, 24 Dec 2013 14:29:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;Tim Slavin&apos;, u&apos;email&apos;: u&apos;TimSlavin@MongoDBs-MacBook-Pro-2.local&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2398&quot; title=&quot;Improve FAQ for Monitoring Agent Robustness&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2398&quot;&gt;&lt;del&gt;DOCS-2398&lt;/del&gt;&lt;/a&gt; Multiple Agents Edit 2&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/06eb261da53d81260c235e93a2158142469689f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/06eb261da53d81260c235e93a2158142469689f9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="474679" author="xgen-internal-githook" created="Tue, 24 Dec 2013 14:29:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;Tim Slavin&apos;, u&apos;email&apos;: u&apos;TimSlavin@MongoDBs-MacBook-Pro.local&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2398&quot; title=&quot;Improve FAQ for Monitoring Agent Robustness&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2398&quot;&gt;&lt;del&gt;DOCS-2398&lt;/del&gt;&lt;/a&gt; multiple agents Edit 1&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/cd98ad8e0d9e37b25fca0c4c6bdba40cba05bcd0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/cd98ad8e0d9e37b25fca0c4c6bdba40cba05bcd0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="469429" author="angshuman.bagchi@10gen.com" created="Wed, 11 Dec 2013 19:26:25 +0000"  >&lt;p&gt;Perhaps a recommendation along the following lines:&lt;/p&gt;

&lt;p&gt;Start out with a single Monitoring agent as it is easier to debug host discoverability/connectivity issues with just one agent. Once the cluster is all set up and being monitored correctly on MMS, consider adding a second Agent to provide redundancy. That way, if one agent fails the other can pick up and there is no break in monitoring. However, the second agent has the same connectivity requirements as the first. So in order to have a seamless transition from one agent to the next, the second agent also needs to be to connect to all monitored hosts. &lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="130824">DOCS-3149</issuekey>
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