# Observability Fundamentals question on Lab 4

**URL:** <https://discuss.elastic.co/t/observability-fundamentals-question-on-lab-4/227203>\
**Category:** Elastic Training\
**Created:** [April 8, 2020, 8:05pm UTC](https://discuss.elastic.co/t/observability-fundamentals-question-on-lab-4/227203 "2020-04-08T20:05:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![math1324](https://avatars.discourse-cdn.com/v4/letter/m/90db22/32.png) [@math1324](https://discuss.elastic.co/u/math1324)\
**Post date:** [April 8, 2020, 8:05pm UTC](https://discuss.elastic.co/t/observability-fundamentals-question-on-lab-4/227203/1 "2020-04-08T20:05:32Z")

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I don't have a "React" option when doing #16 on Lab 4 in the 2.5 hour class on Observability Fundamentals. I thought I followed the instructions, but don't remember starting React. What did I miss?

Below is my APM UI:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/5/5/55ca5983b16b5e97a9af09af35c473c837b422a1.png)

Below is the APM that the lab has:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/b/f/bf8ba90f010df52726f2238694198bac4c7ec078.png)

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**Author:** ![Andre\_Murbach\_Maidl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/andre_murbach_maidl/32/83508_2.png) [@Andre\_Murbach\_Maidl](https://discuss.elastic.co/u/Andre_Murbach_Maidl)\
**Post date:** [April 8, 2020, 8:16pm UTC](https://discuss.elastic.co/t/observability-fundamentals-question-on-lab-4/227203/2 "2020-04-08T20:16:12Z")

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Hi,

the React part of the application runs on the browser and is served by the Node.js backend that you started on step 14.

Please check if you have configured the `apm_server_js` setting in `/home/elastic/petclinic/frontend/config.js` to use the Public DNS of your lab machine, otherwise the RUM agent cannot send information from the client's browser to the APM Server that is running on your lab instance. These are the steps 12 and 13.

Best,  
Andre

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 8, 2020, 8:16pm UTC](https://discuss.elastic.co/t/observability-fundamentals-question-on-lab-4/227203/3 "2020-05-08T20:16:19Z")

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