How to use the @instana/core.init function in @instana/core

function init(event, arnInfo, _config) {
  /* eslint-disable dot-notation */
  config = _config || {};

  if (config.logger) {
    logger = config.logger;
  } else if (config.level || process.env['INSTANA_LOG_LEVEL']) {
    logger.setLevel(config.level || process.env['INSTANA_LOG_LEVEL']);
  }
  identityProvider.init(arnInfo);
  backendConnector.init(identityProvider, logger);

  instanaCore.init(config, backendConnector, identityProvider);

  metrics.init(config);
  metrics.activate();
  tracing.activate();
}

var agentConnection = require('./agentConnection');
  var agentOpts = require('./agent/opts');
  var pidStore = require('./pidStore');
  var uncaught = require('./uncaught');

  var logger;
  logger = log.getLogger('index', function(newLogger) {
    logger = newLogger;
  });
  if (!config.logger) {
    config.logger = logger;
  }

  agentOpts.init(config);
  instanaNodeJsCore.init(config, agentConnection, pidStore);
  uncaught.init(config, agentConnection, pidStore);
  require('./metrics').init(config);
  require('./actions/profiling/cpu').init(config);

  logger.info('@instana/collector module version:', require(path.join(__dirname, '..', 'package.json')).version);
  require('./announceCycle').start();
  return exports;
};