metricsUsers({ db, userId, courseId }) {

  },

  metricsState ({ db, courseId }) {

  },
  metricsProfessores({ db, courseId, ProfessorId}) {

  }

  metrics ({ db, options}, ...args) {

    const metrics = {}

    await Bluebird.map(args, (arg) => {
      if (typeof arg === 'function') {
        metrics[arg] = await MyClass[arg]({db, ...options})
      }
      return null
    }, { concurrency: 3 })


    console.log({metrics})
  }