1. - [X] Mandatory: Add the required version to the Fix version/s field.

2. - [ ] Mandatory: Choose the type of documentation change or review.

• [X] We need to update to an existing topic

• [ ] We need to add a new document to an existing section

• [ ] We need a whole new section; this is a function not
  documented before and doesn't belong in any current section

• [ ] We need an Operator Advisory review and approval

• [ ] We need a z-Stream (Errata) Advisory and Release note for
  MCE and/or ACM

3. - [ ] Mandatory: Find the link to where the documentation update
should go and add it to the recommended changes. You can either use the
published doc or the staged repo for this step:

https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.15/html/observability/observing-environments-intro#external-metric-query

5. - [ ] Mandatory for bugs: What is the diff? Clearly define what the
problem is, what the change is, and link to the current documentation. Only
use this for a documentation bug.

The usage of the environment variable MY_TOKEN is inconsistent in this chapter. Step 2 (retrieve the token) used MY_TOKEN. Executing the curl, which is described in step 4, however used then TOKEN. Also note that PROXY_ROUTE_URL has not been defined in a previous step.