Monkey patch AbstractMysqlAdapter to set mysql 8 resource group while making a new connection

abstract_mysql_adapter.rb

require 'active_record/connection_adapters/abstract_mysql_adapter'

module ActiveRecord
  module ConnectionAdapters
    class AbstractMysqlAdapter
      alias :old_configure_connection :configure_connection

      def configure_connection
        begin
          execute 'SET RESOURCE GROUP etl'
        rescue ActiveRecord::StatementInvalid
          Rails.logger.warn "Unable to set resource group 'etl'"
        end

        old_configure_connection
      end

    end
  end
end