Unable to get "Ingestion Volume" from log Analytics Workspace via Azure Rest API

Hi, trying to capture "Ingestion Volume" from Azure Log analytics using the Azure Rest API. Buts the

script "js_workspace_usage",type: "javascript" do

  code = <<-EOS function filterUsage(data)

{ var usage = []; data.forEach(function(workspace) {

        if (workspace.properties.ingestion > 100) {

          usage.push({ workspace_id: workspace.id,

            workspace_name: workspace.name, daily_data_ingestion: workspace.properties.ingestion

          }); } });

      return usage; } EOS