@type t() :: %HostKit.Apply.Event{
  action: atom() | nil,
  at: DateTime.t(),
  change: HostKit.Change.t() | nil,
  details: map(),
  lifecycle: map() | nil,
  reason: term() | nil,
  resource_id: term(),
  result: map() | nil,
  type: type()
}

@type type() ::
  :apply_started
  | :apply_finished
  | :change_started
  | :change_finished
  | :change_skipped
  | :change_failed
  | :readiness_started
  | :readiness_waiting
  | :readiness_passed
  | :readiness_failed
  | :service_restart_started
  | :service_restart_finished
  | :service_active
  | :service_failed
  | :health_check_started
  | :health_check_waiting
  | :health_check_passed
  | :health_check_failed
  | :instance_launch_started
  | :instance_launch_finished
  | :instance_expose_started
  | :instance_expose_finished
  | :instance_ready_waiting
  | :instance_ready_passed
  | :instance_ssh_bootstrap_started
  | :instance_ssh_bootstrap_finished
  | :transport_retry_started
  | :transport_retry_succeeded
  | :transport_retry_exhausted