feat(slo): add events chart

[kdelemme]

Resolves #170888

Summary

This PR adds a new chart on the SLO details page showing the good vs bad events over the last 24hours.
Timeslice Metric SLOs don't have this chart for the moment.

This PR changes the getPreviewData internal API to handle any arbitrary range { start, end } for computing the preview data with. calculateAuto is used to automatically set the interval to get about 100 buckets.
I've moved the calculateAuto helper function into it's own package. In another PR, I'll remove the duplicated calculateAuto libraries from other plugins.

Screenshots

[apmmachine]

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

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 9775b53

Failed CI Steps

• Serverless Security Cypress Tests #4
• Defend Workflows Cypress Tests on Serverless #4

Test Failures

• [job] [logs] Serverless Security Cypress Tests #4 / Use Value list in exception entry Should use value list in exception entry, and validate deleting value list prompt Should use value list in exception entry, and validate deleting value list prompt

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observability	490	491	+1

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/calculate-auto	-	10	+10

Async chunks

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

id	before	after	diff
observability	1.1MB	1.1MB	+3.7KB

Page load bundle

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

id	before	after	diff
observability	104.1KB	104.2KB	+80.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/calculate-auto	-	10	+10

History

• 💔 Build #174722 failed 4408af9
• 💚 Build #174361 succeeded 2b505556b646a05797b0302c2e877f43f3e53798

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@elasticmachine merge upstream

cc @kdelemme

[mgiota]

@kdelemme Maybe a few words about what the package does?

[mgiota]

At a quick glance it looks good! I will test it locally as well

[mgiota]

@kdelemme Nice! I generated some good and bad events and looks good! I like how hovering on the new chart displays error budget remaining and sli value on the above charts. I just noticed that in the Error budget burn down and Historical SLI charts the last timestamp is 17:00, but the good vs bad events last timestamp is 20:50. Did you notice something similar?

Screen.Recording.2023-11-16.at.20.57.31.mov

[mgiota]

I refreshed now the page (or it auto refreshed) and now all charts are in sync!