fix: expose metrics port using kubernetes_service_patch lib (#332) #333
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This commit ensures the metrics port is exposed in the Kubernetes Service for the jupyter-controller using the kubernetes_service_patch lib. This makes the metrics endpoint reachable from external prometheus scraper.
This commit also changes the unit tests slightly to adapt to the added service patcher.
Part of canonical/bundle-kubeflow#564
The test_prometheus_grafana_integration test case was doing queries to prometheus and checking the request returned successfully and that the application name and model was listed correctly. To make this test case more accurately, we can add an assertion that also checks that the unit is available, this way we avoid issues like the one described in canonical/bundle-kubeflow#564.
Part of canonical/bundle-kubeflow#564