Remove the `environment_metrics_use_prometheus_endpoint` feature flag
What does this MR do?
This PR is a port of gitlab-org/gitlab-ce!29478 to EE. See gitlab-org/gitlab-ce#62094 for the related issue.
Removes the environment_metrics_use_prometheus_endpoint
feature flag from the code base.
This switches charts to utilise the Prometheus API endpoint and makes the feature flagged behaviour the default.
Frontend changes by @jivanvl
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation created/updated or follow-up review issue created -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Performance and testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
Tested in all supported browsers
Security
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
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Label as security and @ mention @gitlab-com/gl-security/appsec
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The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
Security reports checked/validated by a reviewer from the AppSec team
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