Add events for health checks

[pfeuffer]

Proposed changes

This adds events for health check results.

Your checklist for this pull request

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• PR is well described and the description can be used as commit message on squash
• Target branch is not master (in most cases develop should bet the target of choice)
• Code does not conflict with target branch
• New code is covered with unit tests
• Changelog entry file created in gradle/changelog
• Definition of Done's fulfilled: DoD // UI DoD
• Documentation updated (only necessary for new features or changed behaviour)

Checklist for branch merge request (not required for forks)

• Branch is green/blue on Jenkins
• Quality Gate passed on SonarQube