browser-side logging: allow per-logger level configuration

[pgayvallet]

Summary

Part of #144276
Somewhat related to #184520

Allow to configure level of individual browser-side loggers

Example:

logging.browser:
    loggers:
       - name: analytics 
         level: debug

[pgayvallet]

/ci

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[afharo]

🚀

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 8186beb

Failed CI Steps

• Jest Integration Tests #2
• Jest Integration Tests #2

Metrics [docs]

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/core-logging-common-internal	31	34	+3

Page load bundle

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

id	before	after	diff
core	416.9KB	417.2KB	+292.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/core-logging-common-internal	38	41	+3

History

• 💛 Build #213244 was flaky b9e33c8

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