[Metric threshold] Deprecate unsafe.alertDetails.metrics.enabled feature flag

[maryam-saeidi]

Fixes #183489

It also removes the technical preview badge from the metric threshold alert details page.

Having this feature flag now gives you the following warning and even changing it to false will not have any impact:

[2024-06-21T17:09:01.688+02:00][WARN ][config.deprecation] You no longer need to configure "xpack.observability.unsafe.alertDetails.metrics.enabled".

[obltmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[maryam-saeidi]

/ci

[benakansara]

LGTM

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 3d19cc2
• Storybooks Preview
• Kibana Serverless Image: docker.elastic.co/kibana-ci/kibana-serverless:pr-186623-3d19cc258681
• Observability Deployment

Failed CI Steps

• Jest Tests #17
• FTR Configs #87

Test Failures

• [job] [logs] Jest Tests #17 / ColumnsPopover renders correctly a list of selected columns
• [job] [logs] FTR Configs #87 / Observability Logs Explorer DataSourceSelector with installed integrations and uncategorized data streams when open on the integrations tab should display a list of installed integrations

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
observability	288.2KB	288.0KB	-230.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
observability	142.3KB	142.4KB	+62.0B

History

• 💛 Build #217160 was flaky fa3ba4a

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @maryam-saeidi