metrics

record metrics {
  bounce-drops: s32,
  bounces: s32,
  clicks: s32,
  delivered: s32,
  invalid-emails: s32,
  opens: s32,
  requests: s32,
  spam-report-drops: s32,
  spam-reports: s32,
  unique-clicks: s32,
  unique-opens: s32,
  unsubscribes: s32,
}