Logger Service

This service allows plugins to output logging information. There are actually two logger services: a root logger, and a plugin logger which is bound to individual plugins, so that you will get nice messages with the plugin ID referenced in the log lines.

Using the service

The following example shows how to get the logger in your example backend plugin and create a warning message that will be printed nicely to the console.

import {
  coreServices,
  createBackendPlugin,
} from '@backstage/backend-plugin-api';

createBackendPlugin({
  pluginId: 'example',
  register(env) {
    env.registerInit({
      deps: {
        log: coreServices.logger,
      },
      async init({ log }) {
        log.warn("Here's a nice log line that's a warning!");
      },
    });
  },
});