@type t() :: %Autonomic.SemanticObservation{
  confidence: number() | nil,
  latency_ms: number() | nil,
  metadata: map(),
  model: String.t() | nil,
  observed_at: integer(),
  probabilities: map() | nil,
  request_id: String.t() | nil,
  requested_model: String.t() | nil,
  retries: non_neg_integer() | nil,
  sdk_version: String.t() | nil,
  semantic_contract_id: String.t() | nil,
  sensor: atom(),
  sensor_bank_version: String.t() | nil,
  usage: map() | nil,
  value: term()
}