topic Re: RUM - frontend application not visible in Real User Monitoring

RUM - frontend application not visible

MarwanC — Wed, 20 Dec 2023 12:50:57 GMT

Dear Gurus,

I have an issue with IIS on Windows that is not showing neither in Default App or Specifically created Frontend App,

We have successfully enabled all capture setting required as we did in other Apps but is not capturing anything

However, if we invoke the application URL by IP it shows in the default application, otherwise it is not showing anywhere.

The two IIS services are serving the website via a load balancer and the frontend app that we created in DT checks for the rule of the domain that the users are using, They do not use the DNS ip to invoke the URL.

Any idea, what is going on, any config you suggest in Dynatrace to resolve this issue

I appreciate your support in this,

Marwan

Re: RUM - Frontend Application not showing

Julius_Loman — Tue, 19 Dec 2023 15:05:54 GMT

There are practically unlimited reasons for this. I'd suggest using dtHealthCheck as the user agent and then checking the response headers. You can see that in action in one of the community episodes here https://www.youtube.com/watch?v=cBQ_AF5J8m8&t=850s

Re: RUM - Frontend Application not showing

Islam_Zedan — Tue, 19 Dec 2023 06:34:54 GMT

In addition to @Julius_Loman advice, you need also to make sure of all the security requirements for RUM in case that you are using loadbalancer and most probably a WAF.

https://docs.dynatrace.com/docs/shortlink/rum-firewall

Thanks,

Islam

Re: RUM - Frontend Application not showing

Julius_Loman — Tue, 19 Dec 2023 07:23:44 GMT

Yes exactly. First, check if the JavaScript gets injected. If not, validate it using the dtHealthCheck or you can also use the Health Check in the UI:

Maybe the RUM JS cannot be downloaded, or the beacon it sends back cannot be received because of a different context path.

Re: RUM - Frontend Application not showing

MarwanC — Wed, 20 Dec 2023 10:40:27 GMT

We ran the health check. The two items are not clear. As I said the APP the URL with IP is showing correctly in the defaults APP but not showing in the dedicated APP that I created. It means the injection is working but somehow the DT injection is not working on the domain (see attached screenshot)

Re: RUM - Frontend Application not showing

Julius_Loman — Wed, 20 Dec 2023 10:52:25 GMT

Most likely the domain is not propagated to the webserver (host request header is different on the IIS host as some reverse proxy modifies it). Dynatrace then cannot determine the host name. Check the host header on the webserver in Dynatrace (in the distributed traces).

Re: RUM - Frontend Application not showing

AntonPineiro — Wed, 20 Dec 2023 11:38:03 GMT

Hi,

Maybe because you are using opt-mode? It is disabled by default.

If it is turned on, be sure you are calling "dtrum.enable()".

This tip maybe helps.

Best regards

Re: RUM - frontend application not visible

MarwanC — Fri, 26 Jan 2024 10:03:31 GMT

resolved now by enabling opt-mode.

Re: RUM - frontend application not visible

AntonPineiro — Fri, 26 Jan 2024 14:03:42 GMT

Nice, maybe you want to say disabling opt-mode, right?

Re: RUM - frontend application not visible

MarwanC — Wed, 07 Feb 2024 17:40:49 GMT

indeed. resolved now by disabling opt-mode. The description of this flag is confusing may be a rephrase of the description needs to be updated.

Re: RUM - frontend application not visible

sujit_k_singh — Mon, 12 Feb 2024 23:56:19 GMT

@MarwanC Thanks for this post, I had similar issue which got fixed after disabling opt-mode. Even i was bit confused after the going through the description. However, it got fixed.

Thanks

Tijust

Re: RUM - frontend application not visible

MarwanC — Tue, 20 Feb 2024 14:53:27 GMT

To put it bluntly, the current description is like this.

"With Data-collection and opt-in mode enabled, Real User Monitoring data isn't captured until dtrum.enable()
is called for specific user sessions"

As this is the most important flag to make the whole capturing to work,

I suggest Dynatrace product team to rephrase it to the layman to avoid extra double work

I suggest the following:

If the Data-collection and opt-in mode (radio button off) are disabled, Real User Monitoring data
will be captured without needing to call dtrum.enable() for specific user sessions.
When the Data-collection and opt-in mode are enabled (radio button on), Real User Monitoring
data won't be captured until dtrum.enable() is called for specific user sessions.

I hope this is clear to everyone

I have seen many occasions where the double negation is used I will try to help from experience
when possible.

Marwan...