Identify correct usage measures for devops:verify

Looker has a great new report (https://gitlab.looker.com/dashboards/69) showing usage of each of the stages, and how that's changing over time:

Usage for ~Verify users is determined using the following query, which is missing key capabilities of the stage.

  measure:  verify_users{
    type: count_distinct
    group_label: "Product Stages"
    label: "Count of Verfiy Users"
    sql:
       CASE WHEN ${ci_builds} > 0
                 OR ${ci_runners} > 0
       THEN ${host_id}
       ELSE NULL
       END ;;
  }

So two questions here - what measures are missing that already exist, and what measures should be added to get an accurate assessment?