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I would use runner.workflow.workflowSteps to get both measure inputs and runner.registerValue information on upstream measures. It should work locally on PAT or on the Server

The code below will add an info statement for every measure argument and every runner.registerValue. It even returns values for downstream measure arguments that have not run yet.

If your reporting measures save data from sql queries as a runner.registerValue then you can get that here as well (only for upstream measures that have already run).

# 2.x methods (currently setup for measure display name but snake_case arg names)
runner.workflow.workflowSteps.each do |step|
  if step.to_MeasureStep.is_initialized
    measure_step = step.to_MeasureStep.get

    measure_name = measure_step.measureDirName
    if measure_step.name.is_initialized
      measure_name = measure_step.name.get # this is instance name in PAT
    end
    if measure_step.result.is_initialized
      result = measure_step.result.get
      result.stepValues.each do |arg|
        name = arg.name
        value = arg.valueAsVariant.to_s
        runner.registerInfo("#{measure_name}: #{name} = #{value}")
      end
    else
      #puts "No result for #{measure_name}"
    end
  else
    #puts "This step is not a measure"
  end
end

A PAT project script would have access to this same information but across multiple datapoints.