config/doc/probe/metric_def.textproto

metric_spec: {
  id: "file_metric_def_textproto"
  value: "metric_column"
  query {
    id: "query_id"
    table {
      table_name: "metric_table"
      module_name: "module_name"
      column_names: "metric_column"
    }
  }
}