You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: workflow_placeholder_variables_instrumentation.rb
    path of file: ./repos/open-build-service/src/api/app/instrumentations
    
    the code of the file until where you have to start completion: module WorkflowPlaceholderVariablesInstrumentation
  private

  def track_placeholder_variables(workflows_file_content)
    placeholder_variables = workflows_file_content.match(/%{(SCM_.*)}/)&.captures
    # There are no placeholder variables in the workflows file
    return if placeholder_variables.blank?

    supported_placeholder_variables = placeholder_variables.select do |placeholder_variable|
      Workflows::YAMLToWorkflowsService::SUPPORTED_PLACEHOLDER_VARIABLES.include?(placeholder_variable.to_sym)
    e
    
  def track_placeholder_variables(workflows_file_content)
    placeholder_variables = workflows_file_content.match(/%{(SCM_.*)}/)&.captures
    # There are no placeholder variables in the workflows file
    return if placeholder_variables.blank?

    supported_placeholder_variables = placeholder_variables.select do |placeholder_variable|
      Workflows::YAMLToWorkflowsService::SUPPORTED_PLACEHOLDER_VARIABLES.include?(placeholder_variable.to_sym)
    end

    # The matches are not supported placeholder variables
    return if supported_placeholder_variables.empty?

    supported_placeholder_variables.each do |placeholder_variable|
      RabbitmqBus.send_to_bus('metrics', "workflow_placeholder_variables,name=#{placeholder_variable} count=1")
    end
  end