How to use the @promster/metrics.createMetricTypes function in @promster/metrics

const createPlugin = ({ options: pluginOptions } = {}) => {
  const defaultedOptions = merge(
    createMetricTypes.defaultedOptions,
    createRequestRecorder.defaultedOptions,
    defaultNormalizers,
    pluginOptions
  );

  const metricTypes = createMetricTypes(defaultedOptions);
  const observeGc = createGcObserver(metricTypes);

  recordRequest = createRequestRecorder(metricTypes, defaultedOptions);
  upMetric = metricTypes && metricTypes.up;

  observeGc();

  const plugin = {
    name: pkg.name,
    version: pkg.version,
    register(server, registrationOptions, onRegistrationFinished = () => null) {
      const areServerEventsSupported = getAreServerEventsSupported(
        server.version
      );
      const doesResponseNeedInvocation = getDoesResponseNeedInvocation(
        server.version

const createMiddleware = ({ app, options } = {}) => {
  let defaultedOptions = merge(
    createMetricTypes.defaultedOptions,
    createRequestRecorder.defaultedOptions,
    defaultNormalizers,
    options
  );

  const metricTypes = createMetricTypes(defaultedOptions);
  const observeGc = createGcObserver(metricTypes);

  recordRequest = createRequestRecorder(metricTypes, defaultedOptions);
  upMetric = metricTypes && metricTypes.up;

  exposeOnLocals(app, { key: 'Prometheus', value: Prometheus });
  exposeOnLocals(app, { key: 'recordRequest', value: recordRequest });

  observeGc();

  return (request, response, next) => {
    const start = process.hrtime();
    response.on('finish', () => {
      const labels = Object.assign(
        {},
        {

const createPlugin = async (fastify, options) => {
  const defaultedOptions = merge(
    createMetricTypes.defaultedOptions,
    createRequestRecorder.defaultedOptions,
    defaultNormalizers,
    options
  );

  const metricTypes = createMetricTypes(defaultedOptions);
  const observeGc = createGcObserver(metricTypes);

  recordRequest = createRequestRecorder(metricTypes, defaultedOptions);
  upMetric = metricTypes && metricTypes.up;

  observeGc();

  fastify.decorate('Prometheus', Prometheus);
  fastify.decorate('recordRequest', recordRequest);
  fastify.decorateRequest('__promsterStartTime__', null);

  fastify.addHook('onRequest', async (request, _) => {
    request.__promsterStartTime__ = process.hrtime();
  });

  fastify.addHook('onResponse', async (request, reply) => {

const createMiddleware = ({ options } = {}) => {
  const defaultedOptions = merge(
    createMetricTypes.defaultedOptions,
    createRequestRecorder.defaultedOptions,
    defaultNormalizers,
    options
  );

  const metricTypes = createMetricTypes(defaultedOptions);
  const observeGc = createGcObserver(metricTypes);

  recordRequest = createRequestRecorder(metricTypes, defaultedOptions);
  upMetric = metricTypes && metricTypes.up;

  observeGc();

  function middleware(req$, res) {
    return req$.pipe(
      map(req => ({ req, start: process.hrtime() })),
      tap(recordHandler(res, defaultedOptions)),
      map(({ req }) => req)
    );
  }

  return middleware;