Logging service
editLogging service
editAllows a plugin to provide status and diagnostic information.
The Logging service is only available server side.
import type { PluginInitializerContext, CoreSetup, Plugin, Logger } from '@kbn/core/server';
export class MyPlugin implements Plugin {
private readonly logger: Logger;
constructor(initializerContext: PluginInitializerContext) {
this.logger = initializerContext.logger.get();
}
public setup(core: CoreSetup) {
try {
this.logger.debug('doing something...');
// …
} catch (e) {
this.logger.error('failed doing something...');
}
}
}
Usage
editUsage is very straightforward, one should just get a logger for a specific context and use it to log messages with different log level.
const logger = kibana.logger.get('server');
logger.trace('Message with `trace` log level.');
logger.debug('Message with `debug` log level.');
logger.info('Message with `info` log level.');
logger.warn('Message with `warn` log level.');
logger.error('Message with `error` log level.');
logger.fatal('Message with `fatal` log level.');
const loggerWithNestedContext = kibana.logger.get('server', 'http');
loggerWithNestedContext.trace('Message with `trace` log level.');
loggerWithNestedContext.debug('Message with `debug` log level.');
And assuming logger for server name with console appender and trace level was used, console output will look like this:
[2017-07-25T11:54:41.639-07:00][TRACE][server] Message with `trace` log level. [2017-07-25T11:54:41.639-07:00][DEBUG][server] Message with `debug` log level. [2017-07-25T11:54:41.639-07:00][INFO ][server] Message with `info` log level. [2017-07-25T11:54:41.639-07:00][WARN ][server] Message with `warn` log level. [2017-07-25T11:54:41.639-07:00][ERROR][server] Message with `error` log level. [2017-07-25T11:54:41.639-07:00][FATAL][server] Message with `fatal` log level. [2017-07-25T11:54:41.639-07:00][TRACE][server.http] Message with `trace` log level. [2017-07-25T11:54:41.639-07:00][DEBUG][server.http] Message with `debug` log level.
The log will be less verbose with warn level for the server logger:
[2017-07-25T11:54:41.639-07:00][WARN ][server] Message with `warn` log level. [2017-07-25T11:54:41.639-07:00][ERROR][server] Message with `error` log level. [2017-07-25T11:54:41.639-07:00][FATAL][server] Message with `fatal` log level.