[chore] docs: extension/observer/k8sobserver: Add k8s_observer to service.extensions in example config #42065
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Description
The example configuration in the
k8s_observerREADME omitsk8s_observerfromservice.extensions, causing the Collector to fail on startup. This PR adds it, so the example is complete and works as intended.Link to tracking issue
None.
Testing
Manually tested with the updated example in a Kubernetes cluster: Collector starts and the observer is functional.
Documentation
Only the README example is updated; no further docs changes are needed.