on
20 Mar 2024
05:20 PM
- edited on
22 Sep 2025
07:59 AM
by
MargitM
After successfully setting up Real User Monitoring (RUM) for your web application, you should begin to see RUM data appear in your Dynatrace environment. If no data is being captured, this guide will help you identify and resolve potential issues.
💡 Tip: Before diving into the troubleshooting steps, check whether the Application Health Check reports any issues for your application.
If you're not seeing any RUM data for your application in the Dynatrace web UI, start by verifying that it is receiving traffic. Interact with your application pages to generate user activity.
Once you've confirmed that traffic is flowing to your application, proceed with the steps below.
Check whether the captured RUM data is being assigned to a different application than expected. A common scenario is that the data ends up in the fallback application named My web application.
If this applies to your case, follow the steps outlined in RUM data is assigned to a different application than expected to resolve the issue.
Load one of your pages, inspect its source in a web browser, and make sure that the <HEAD>
element contains a reference to the RUM JavaScript. To identify the RUM JavaScript, proceed as follows.
Different snippet formats are available for automatic injection. A common characteristic among them is the presence of the string data-dtconfig
, either as an attribute or embedded within the code. To verify that the RUM JavaScript has been injected, look for a script element that includes this string.
If you don't see the RUM JavaScript automatically injected by OneAgent into your webpages, check RUM JavaScript isn't injected.
If you're using the snippet format JavaScript tag, search for a script that ends with the string _complete.js
and is loaded from js-cdn.dynatrace.com
or, in case of Managed, your own CDN. If you use Dynatrace Managed and have not set up your own CDN yet, the script is loaded from a domain in Dynatrace Managed.
If you are using one of the other snippet formats, the string data-dtconfig
should be present, either as an attribute or embedded within the code.
If you don't see the RUM JavaScript manually inserted into your webpages, refer to Set up agentless Real User Monitoring.
If you are using the snippet format code snippet and want to check if the second script element containing the full functionality of the monitoring code has been injected successfully, open the Elements tab in the Chrome DevTools and search for an id
attribute that contains dtjsagent
or dtjsagentdw
.
The Dynatrace RUM JavaScript is downloaded along with the other resources of your web page. To confirm that the download was successful, open the Network tab in your browser’s developer tools. Look for a request URL that contains one of the following strings:
_complete.js
if you're using the JavaScript tag snippet formatruxitagent
– for other snippet formats, orThe response should have a 200 OK
status and the body should contain JavaScript code.
An example is shown in the screenshots below.
If the RUM JavaScript hasn't downloaded correctly, refer to RUM JavaScript isn't downloadable.
To check if the RUM JavaScript has initialized successfully on your page, check whether the dT_
JavaScript object exists. Open your browser developer console, enter dT_
, and press Enter. As a result, an object should be returned. Otherwise, you will find logs in the browser console that help you identify the issue.
The RUM JavaScript sends the captured data as beacon requests—which are HTTP POST requests—to a designated beacon endpoint.
Alternative configurations are possible, see Configure beacon endpoint for web applications.
You can check these requests in the Network tab of your browser's developer tools.
If the beacon requests are handled by OneAgent, look for requests with a URL where the path begins with rb_
.
If a Cluster ActiveGate is used, you can identify beacon requests as follows:
bf
.bf
.Responses should have the 200 OK
status, and the response body should start with OK
. If the response body starts with FL
, the RUM beacon was rejected and not forwarded to the server. The response contains additional information about the problem. For further details, check RUM JavaScript doesn't report data to server.
This section provides guidance on how to further troubleshoot the issues identified during the triage process above.
If you don't see the RUM JavaScript automatically injected by OneAgent into your webpages, it's probably because of one of the following reasons.
Your application web frontend process is not monitored. You can verify this as follows:
Dynatrace OneAgent could not identify the content as HTML or canceled the injection attempt due to an invalid HTML structure or incorrect encodings. Make sure that you're using well-formed HTML with opening and closing tags for <HTML>
and <HEAD>
. See Configure automatic injection to learn how OneAgent injects the RUM JavaScript into your application.
The request maps to a different application than expected because application detection was set up incorrectly. Either the pattern is incorrect, or the associated web servers operate behind proxies or other components that are rewriting the URL. For details, see What can I do if an uninstrumented component rewrites parts of the URL?.
The application that is detected by OneAgent on the first instrumented tier is not propagated to subsequent OneAgents because the x-dynatrace-application
header is removed by a firewall or proxy.
You have defined exclusion rules for browsers, robots, and spiders.
If you see that the RUM JavaScript isn't downloadable, there might be a few reasons for that.
https://js-cdn.dynatrace.com
isn't reachable for client browsers due to firewall rules or proxy server configuration. Connections to and from the host must be allowed..../ruxitagentjs_...
).To resolve a JavaScript download issue caused by a missing root application, configure an accessible path (for example, a valid servlet path) as described in Modify the monitoring code URL path.
If you see that the RUM beacons are rejected and not forwarded to the server, there might be several reasons for that.
If you're still not seeing any RUM data for your application after completing the troubleshooting steps above, please reach out to Dynatrace via the in-product chat or by creating a support ticket for further assistance. Provide the following information:
This is a wonderful reference! Thanks for taking the time to write something like this up - I'm sure a lot of people will find it useful when troubleshooting!
Hi ,
Dynatrace Java script is not injecting for me , we have akamai and another webser , what is the trouble shooting that i can do.
Hi @Amarnadh_Sunkar ,
We had the same situation and we solved it configurating the application as agentless. Here you have the documentation.
Hope it helps.
Regards,
Elena.
Thanks Elena,
I am trying in agentless , do you have any time to connect for 30 minutes.