@type t() :: %Kvasir.Event.Meta{
  key: term(),
  key_type: term(),
  meta: map(),
  offset: non_neg_integer(),
  partition: non_neg_integer(),
  source: module(),
  sub_key: nil | [atom() | {atom(), term()}],
  timestamp: UTCDateTime.t(),
  topic: String.t()
}