Implement Logger.isLevelEnabled

[pgayvallet]

Summary

Fix #144002

Implement Logger.isLevelEnabled (similar to log4j's isEnabled / isInfoEnabled and so on...), to allow to wrap log writing inside conditional blocks.

if(logger.isLevelEnabled('debug')) {
  const debugData = someExpensiveDebugOperation();
  logger.debug('here is the debug data', debugData);
}

[elasticmachine]

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

[afharo]

LGTM

[dokmic]

nit:

Suggested change

	for (const logLevel of orderedLogLevels) {
	it(`returns the correct value for a '${logLevel.id}' level logger`, () => {
	const levelLogger = new BaseLogger(context, logLevel, appenderMocks, factory);
	for (const level of orderedLogLevels) {
	const levelEnabled = logLevel.supports(level);
	expect(levelLogger.isLevelEnabled(level.id)).toEqual(levelEnabled);
	}
	});
	}
	it.each(orderedLogLevels)(`returns the correct value for a '$id' level logger`, (logLevel) => {
	const levelLogger = new BaseLogger(context, logLevel, appenderMocks, factory);
	for (const level of orderedLogLevels) {
	const levelEnabled = logLevel.supports(level);
	expect(levelLogger.isLevelEnabled(level.id)).toEqual(levelEnabled);
	}
	});

[nchaulet]

LGTM this is exactly what we need in Fleet.

[ymao1]

Response Ops changes LGTM.

[pmuellr]

LGTM

[pgayvallet]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 7dc1f5d

Metrics [docs]

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
@kbn/logging	37	38	+1

Page load bundle

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

id	before	after	diff
core	369.4KB	369.4KB	+36.0B
expressions	98.0KB	98.1KB	+22.0B
total			+58.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/logging	30	32	+2
core	2700	2702	+2
total			+4

History

• 💛 Build #82918 was flaky dc1062e
• 💔 Build #82873 failed 1507dac
• 💔 Build #82821 failed cd8a04d

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