Generating Prometheus metrics text timed out

[Fivell]

Hello running ruby 2.5.5 with puma

puma.rb

...
preload_app!

# Allow puma to be restarted by `rails restart` command.
plugin :tmp_restart

before_fork do
  require 'puma_worker_killer'
  PumaWorkerKiller.config do |config|
    ```
  end
  PumaWorkerKiller.start
end

on_worker_boot do
  ActiveRecord::Base.establish_connection if defined?(ActiveRecord::Base)

  if CONFIG['prometheus']['enabled']
    require 'prometheus_exporter/instrumentation'
    PrometheusExporter::Instrumentation::Process.start type: 'web',
                                                       labels: CONFIG['prometheus']['default_labels']
  end
end

after_worker_boot do
  if CONFIG['prometheus']['enabled']
    require 'prometheus_exporter/instrumentation'
    PrometheusExporter::Instrumentation::Puma.start
  end
end

intializer

# frozen_string_literal: true
if Rails.env != 'test' && CONFIG['prometheus']['enabled'] && !defined?(::Rake)

# NOTE: as we have different processes but want 1 interface for prometheus to scrape the metrics
# we send the metrics to a collector container
# this process need to be started as a separate process
#
# Prometheus Ports:
# https://github.com/prometheus/prometheus/wiki/Default-port-allocations

  require 'prometheus_exporter/metric'
  PrometheusExporter::Metric::Base.default_labels = CONFIG['prometheus']['default_labels']

# Connect to Prometheus Collector Process
  require 'prometheus_exporter/client'
  my_client = PrometheusExporter::Client.new(host: CONFIG['prometheus']['host'],
                                             port: CONFIG['prometheus']['port'],
                                             custom_labels: CONFIG['prometheus']['default_labels'])

# Set Default Client
  PrometheusExporter::Client.default = my_client
# This reports stats per request like HTTP status and timings
  require 'prometheus_exporter/middleware'
  Rails.application.middleware.unshift PrometheusExporter::Middleware

# this reports basic process stats like RSS and GC info
  require 'prometheus_exporter/instrumentation'
  PrometheusExporter::Instrumentation::DelayedJob.register_plugin

  PrometheusExporter::Instrumentation::Process.start(type: 'master', labels: CONFIG['prometheus']['default_labels'])
end

after some time prometheus exporter logs contain ''' Generating Prometheus metrics text timed out '''

and exporter doesn't return metrics