https://community.dynatrace.com/t5/Troubleshooting/Browser-Monitors-Automatically-assigned-applications/ta-p/265704 <H2>Summary</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Dynatrace Synthetic <STRONG>Browser Monitors</STRONG> can be <STRONG><A href="https://docs.dynatrace.com/docs/observe/digital-experience/synthetic-monitoring/browser-monitors/configure-browser-monitors#assigned-applications" target="_self">automatically assigned to Real User Monitoring (RUM)</A> applications</STRONG> when they execute against pages that include RUM JavaScript injection. This automatic assignment enables deeper analysis by linking synthetic executions with user sessions, actions, and distributed traces inside the application view.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">In some scenarios, however, automatic assignment doesn’t occur as expected. This article explains how application auto‑assignment works, why it may fail, and what to verify when a Browser Monitor isn’t linked to a RUM application.</DIV> </DIV> <P>&nbsp;</P> <P><LI-TOC indent="15" liststyle="disc" maxheadinglevel="3"></LI-TOC></P> <P>&nbsp;</P> <H2>What is Application auto-assignment?</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Application auto‑assignment occurs when a <STRONG>Browser Monitor visits a page that has Dynatrace RUM injection enabled</STRONG>. During execution, the Dynatrace Synthetic Player detects the RUM JavaScript and automatically associates the Browser Monitor with the corresponding RUM application.&nbsp;</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <H3>Why this matters</H3> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Automatic assignment provides several benefits compared to manual assignment:</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Synthetic sessions appear inside the <STRONG>RUM application</STRONG> as sessions from a <EM>Synthetic user</EM></LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">You can analyze Browser Monitor executions using <STRONG>Session Segmentation</STRONG></LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">You can navigate between <STRONG>user actions and synthetic executions</STRONG></LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Related <STRONG>distributed traces</STRONG> can be accessed directly from Browser Monitor results</LI> </UL> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">This correlation helps connect availability issues detected by Synthetic Monitoring with real application behavior and backend performance.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol"> <DIV> <H3>How linking works between Browser Monitors and RUM</H3> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">When auto‑assignment is successful, Dynatrace creates bidirectional links:</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">From a <STRONG>RUM user action</STRONG>, you can jump to the corresponding Browser Monitor execution</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">From a <STRONG>Browser Monitor execution</STRONG>, you can open the related user action in the RUM application</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">From a Browser Monitor execution, you can access <STRONG>traces</STRONG> via the <EM>Detailed breakdown</EM> section</LI> </UL> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">These links make it easier to troubleshoot performance or availability issues end‑to‑end.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <H3 class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Examples</H3> </DIV> </DIV> <H4 class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol"><SPAN>Session Segmentation</SPAN></H4> </DIV> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="HannahM_0-1735050200701.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/25468iBA713BF8DD567FE3/image-size/medium?v=v2&amp;px=400" role="button" title="HannahM_0-1735050200701.png" alt="HannahM_0-1735050200701.png" /></span></P> <P>&nbsp;</P> <H4>Link from a user action in a user session to a Browser Monitor execution</H4> <P>Clicking on Perform Waterfall Analysis for an action in a Session will take you to the step in the relevant execution in Synthetic Monitoring</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="HannahM_1-1735050375646.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/25469i86A4B87163B82EB0/image-size/medium?v=v2&amp;px=400" role="button" title="HannahM_1-1735050375646.png" alt="HannahM_1-1735050375646.png" /></span>&nbsp;&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="HannahM_2-1735050502252.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/25470iDF6E68B208A9F39E/image-size/medium?v=v2&amp;px=400" role="button" title="HannahM_2-1735050502252.png" alt="HannahM_2-1735050502252.png" /></span></P> <P>&nbsp;</P> <H4>Link from a Browser Monitor execution to a user action</H4> <P>The link also works in reverse. Browser Monitor executions link to the relevant User Action in the RUM Application. Clicking on the user action link, a clickable URL in blue, will open the relevant User Action details page.&nbsp;</P> <P>&nbsp;</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="HannahM_4-1735050719262.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/25472i926B66391C117B98/image-size/medium?v=v2&amp;px=400" role="button" title="HannahM_4-1735050719262.png" alt="HannahM_4-1735050719262.png" /></span>&nbsp;&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="HannahM_5-1735050779347.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/25473i78FF9BD23C73213F/image-size/medium?v=v2&amp;px=400" role="button" title="HannahM_5-1735050779347.png" alt="HannahM_5-1735050779347.png" /></span></P> <P>&nbsp;</P> <H4>Link to traces from a Browser Monitor</H4> <P>To view traces from a Browser Monitor, open an execution and click on the relevant event. Scroll down to the 'Detailed breakdown' section and click on the Traces tile, as shown <A href="https://docs.dynatrace.com/docs/observe/digital-experience/web-applications/analyze-and-use/waterfall-analysis#purepath-drilldown" target="_self">here</A></P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="HannahM_0-1736523072709.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/25652iAD2FAC5D8DF2B9C5/image-size/medium?v=v2&amp;px=400" role="button" title="HannahM_0-1736523072709.png" alt="HannahM_0-1736523072709.png" /></span></P> <H2>&nbsp;</H2> <H2>Troubleshooting missing automatic assignment</H2> <DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">If a Browser Monitor is <STRONG>not automatically assigned</STRONG> to a RUM application, verify the following.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <H3>1. Confirm the Browser Monitor visits a RUM‑injected page</H3> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Automatic assignment only works if the pages visited by the Browser Monitor are <STRONG>actually injected with RUM</STRONG>. If the monitor never reaches an injected page, no application information can be detected</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol"> <H3>2. Check the position of the RUM JavaScript (<CODE>jsAgent</CODE>) tag</H3> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">For Synthetic Monitoring, the <STRONG>RUM JavaScript must be the first script loaded on the page</STRONG>.</DIV> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">This requirement is specific to <STRONG>Synthetic executions</STRONG></LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Real users may still be monitored even if the script isn’t first</LI> </UL> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">If automatic injection is used, you can configure an <A href="https://docs.dynatrace.com/docs/observe/digital-experience/web-applications/initial-setup/rum-injection#where-is-rum-js-injected" target="_self"><STRONG>injection rule</STRONG></A> to control where the script is inserted. If manual injection is used, work with the team managing the page to ensure the <CODE>jsAgent</CODE> script tag is loaded first.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol"> <H3>3. Verify that Synthetic executions are not excluded from RUM injection</H3> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">When manual injection is used, confirm that there are <STRONG>no rules excluding Synthetic executions</STRONG> from RUM injection. If Synthetic traffic is excluded, the Browser Monitor cannot be auto‑assigned to an application.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol"> <H3>4. Verify that the RUM JavaScript (<CODE>jsAgent</CODE>) tag matches the expected format</H3> <P><SPAN>If manual injection is being used, confirm that the jsAgent script filename matches&nbsp;expected format:</SPAN></P> </DIV> </DIV> </DIV> </DIV> <DIV class="code-block css-no7p6y"><SPAN class="prismjs css-vj0t3u" data-code-lang="" data-ds--code--code-block=""><CODE class="language-"><SPAN class="">&lt;name&gt;_&lt;featurehash&gt;_&lt;version&gt;.js</SPAN></CODE>&nbsp;or&nbsp;<CODE class="language-"><SPAN class="">&lt;appid&gt;_complete.js</SPAN></CODE></SPAN></DIV> <P>Synthetic only supports these formats.&nbsp;</P> <P>&nbsp;</P> <H3>5. Verify that the RUM JavaScript (<CODE>jsAgent</CODE>) is a supported version</H3> <P><SPAN class="prismjs css-vj0t3u" data-code-lang="" data-ds--code--code-block="">Confirm that the jsAgent is a supported version, using the <A href="https://docs.dynatrace.com/docs/observe/digital-experience/web-applications/initial-setup/app-health-check" target="_self">Application Health check</A>.&nbsp;</SPAN></P> <P>&nbsp;</P> <DIV> <H3>Key limitations to be aware of</H3> <UL> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Automatic assignment <STRONG>cannot be disabled</STRONG> if a Browser Monitor visits a RUM‑injected page</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Assignment is detected <STRONG>at runtime</STRONG>, not during monitor configuration</LI> <LI class="___ccc16d0 fje8fi8 f1ng9h0j f1bwykku f18jd3zf">Manual assignment is still possible, but auto‑assignment provides deeper correlation</LI> </UL> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">Understanding these constraints helps set expectations when designing Synthetic Monitoring strategies.</DIV> <DIV class="paragraph-in-scc-markdown-text ___1ngh792 ftgm304 f1iaxwol">&nbsp;</DIV> </DIV> <H2>What's Next</H2> <P>If you've resolved the issues highlighted above but are still not seeing any Synthetic sessions in your RUM Application, then please open a chat or Support ticket and provide the following information:</P> <OL> <LI>Link to the Browser Monitor in your environment</LI> <LI>Link to the RUM Application in your environment</LI> </OL> <P>&nbsp;</P> <H3>Related reading</H3> <P><SPAN><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp;&nbsp;</SPAN><A class="" href="https://community.dynatrace.com/t5/Troubleshooting/Synthetic-Troubleshooting-Map/ta-p/250426" target="_blank" rel="noopener">Synthetic Troubleshooting Map</A></P> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp; <A href="https://docs.dynatrace.com/docs/observe/digital-experience/synthetic-monitoring/browser-monitors/configure-browser-monitors#assigned-applications" target="_self">Browser Monitor assigned applications</A></P> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp;&nbsp;<A id="link_4" class="page-link lia-link-navigation lia-custom-event" href="https://community.dynatrace.com/t5/Troubleshooting/Troubleshooting-automatic-RUM-injection-failures/ta-p/287116?search-action-id=71475262358&amp;search-result-uid=287116" target="_blank" rel="noopener">Troubleshooting automatic&nbsp;<SPAN class="lia-search-match-lithium">RUM</SPAN>&nbsp;<SPAN class="lia-search-match-lithium">injection</SPAN>&nbsp;failures</A>&nbsp;&nbsp;</P> Wed, 29 Apr 2026 10:14:13 GMT HannahM 2026-04-29T10:14:13Z https://community.dynatrace.com/t5/Troubleshooting/Browser-Monitors-Automatically-assigned-applications/ta-p/265704 <P><LI-TOC indent="15" liststyle="disc" maxheadinglevel="2"></LI-TOC></P> <DIV class="lia-message-template-content-zone"> <P>*<EM>Use a table of contents for longer articles.&nbsp;</EM></P> <H1>Summary</H1> <P><EM>*This is a mandatory section.</EM></P> <P><EM>Short description of which part of the Dynatrace platform the article refers to and what kind of problem it will help resolve / task it will describe.</EM></P> <P>&nbsp;</P> <H1>Problem</H1> <P><EM>*This is a mandatory section.</EM></P> <P><EM>Provide a precise description of the problem / task to be described.</EM></P> <P>&nbsp;</P> <H1>Troubleshooting steps</H1> <P><EM>*This section can be omitted.</EM></P> <P>&nbsp;</P> <H1>Resolution</H1> <P><EM>*This section can be omitted for ticket‑creation articles.</EM></P> <H1>What's next</H1> <P><EM>*This is a mandatory section.</EM></P> </DIV> Wed, 29 Apr 2026 10:14:13 GMT https://community.dynatrace.com/t5/Troubleshooting/Browser-Monitors-Automatically-assigned-applications/ta-p/265704 HannahM 2026-04-29T10:14:13Z