Ruby on Rails

Can anybody provide some links to how to set up correctly Lograge, logstash-logger with a Rails API app ? I followed their READMEs but still nothing sent to Kibana :(.

Here is how these gems are declared in Gemfile:

group :development do

  gem 'lograge',         '~> 0.10.0'
  gem 'logstash-event',  '~> 1.2'
  gem 'logstash-logger', '~> 0.26.1'
end

I added the following lines in  config/environments/development.rb:

config.lograge.enabled = true
  config.lograge.base_controller_class = 'ActionController::API'
  config.lograge.formatter = Lograge::Formatters::Logstash.new
  #config.lograge.logger = LogStashLogger.new(uri: ENV['logstash_uri'], verify_hostname: false)
  config.lograge.logger = LogStashLogger.new(host: ENV['logstash_host'], port: ENV['logstash_port'], verify_hostname: false)
  config.lograge.custom_options = lambda do |event|
    { name: "decastore-development" }
  end

As you see, I tried 2 different ways to initialize LogStashLogger, but still without success.

What's wrong with that ? 

I'm using Rails 5.2.0 (API only), ruby 2.5.0.

Thank you