message: More stable clients number
diff: @@ -56,10 +56,10 @@ function bindPrometheus (app) {
  subscribingTime.observe(latency)
  })
  app.on('connected', () => {
  - clientCount.inc()
  + clientCount.set(Object.keys(app.connected).length)
  })
  app.on('disconnected', () => {
  - clientCount.dec()
  + clientCount.set(Object.keys(app.connected).length)
  })
  app.on('clientError', () => {
  errorCount.inc()
  