Alert on an error budget burn rate

- alert: CheckoutBudgetBurningFast
  expr: |
    (1 - (
      sum(rate(http_requests_total{route="checkout",status=~"2.."}[1h]))
      / sum(rate(http_requests_total{route="checkout"}[1h]))
    )) > 14.4 * 0.005
  for: 2m
  labels: { severity: page }