prevent /ping requests from being written in centralized_logs

fix #8926

config/initializers/lograge.rb

@@ -40,6 +40,7 @@ Rails.application.configure do
 
   config.lograge.keep_original_rails_log = true
   config.lograge.logger = ActiveSupport::Logger.new(Rails.root.join('log', "logstash_#{Rails.env}.log"))
+  config.lograge.ignore_actions = ['PingController#index']
 end
 
 Rails.application.config.after_initialize do |app|