How to use the oncall.metrics.init function in oncall

def main(config):
    global LDAP_SETTINGS

    LDAP_SETTINGS = config['ldap_sync']

    metrics.init(config, 'oncall-ldap-user-sync', stats)
    spawn(metrics_sender)
    # Default sleep one hour
    sleep_time = config.get('user_sync_sleep_time', 3600)
    engine = create_engine(config['db']['conn']['str'] % config['db']['conn']['kwargs'],
                           **config['db']['kwargs'])
    while 1:
        logger.info('Starting user sync loop at %s' % time.time())
        sync(config, engine)
        logger.info('Sleeping for %s seconds' % sleep_time)
        sleep(sleep_time)

def main():
    with open(sys.argv[1], 'r') as config_file:
        config = yaml.safe_load(config_file)

    init_notifier(config)
    metrics_on = False
    if 'metrics' in config:
        metrics.init(config, 'oncall-notifier', {'message_blackhole_cnt': 0, 'message_sent_cnt': 0, 'message_fail_cnt': 0})
        metrics_worker = spawn(metrics_sender)
        metrics_on = True
    else:
        logger.warning('Not running with metrics')

    init_messengers(config.get('messengers', []))

    worker_tasks = [spawn(worker) for x in xrange(100)]
    reminder_on = False
    if config['reminder']['activated']:
        reminder_worker = spawn(reminder.reminder, config['reminder'])
        reminder_on = True
    validator_on = False
    if config['user_validator']['activated']:
        validator_worker = spawn(user_validator.user_validator, config['user_validator'])
        validator_on = True