The event nobody consumed, published for two years

An event published on every order, with no subscribers since the service that listened was removed in 2022.

$ ./bin/event-consumers order.line_adjusted
  subscribers: 0
  published (30d): 412,884

$ ./bin/event-consumers --all | awk '$2==0'
  order.line_adjusted        412,884
  customer.profile_viewed  1,208,104
  cart.abandoned              88,204

Three events with no subscribers and one and a half million publishes a month, each of which is a serialisation, a broker round trip and a row in the outbox. Nothing failed, which is why it survived — an event with no consumers is indistinguishable from a healthy one unless something counts. The script that counts them now runs monthly.