Add pie chart for DevWorkspace startup failure reasons

[dkwon17]

Signed-off-by: David Kwon dakwon@redhat.com

What does this PR do?

Adds a pie chart for DevWorkspace startup failures, where each failure reason is its own category:

What issues does this PR fix or reference?

eclipse-che/che#20661

Is it tested? How?

To test:

1. Follow these steps to run Prometheus and Grafana locally: https://github.com/devfile/devworkspace-operator/tree/main/doc/grafana#testing-devworkspace-operator-metrics-locally.
2. Import the dashboard (grafana-dashboard.json) in Grafana.
3. Run make install to install the controller.
4. Create failing DevWorkspace CR instances (for example, change image urls to non-existent ones in https://github.com/devfile/devworkspace-operator/blob/main/samples/flattened_theia-next.yaml) to increment the devworkspace_fail_total Prometheus counter
5. View the pie chart in the dashboard imported from step 2.

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[amisevsk]

LGTM apart from the trailing newline Ilya mentioned.

[amisevsk]

/test v8-devworkspace-operator-e2e, v8-che-happy-path

[dkwon17]

Thank you everyone, I have pushed the change.

[openshift-ci]

@ibuziuk: changing LGTM is restricted to collaborators

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amisevsk, dkwon17, ibuziuk, JPinkney

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[amisevsk]

/ok-to-test
/test v8-devworkspace-operator-e2e, v8-che-happy-path
/lgtm

[openshift-ci]

New changes are detected. LGTM label has been removed.

[dkwon17]

Updated the commit message to satisfy the Semantic Pull Request check

[amisevsk]

/test v8-devworkspace-operator-e2e, v8-che-happy-path

[openshift-ci]

@dkwon17: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v8-che-happy-path	50ddf6d	link	true	/test v8-che-happy-path

Full PR test history. Your PR dashboard.

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