missing Tracer. set_status/2

[dvic]

Currently Tracer.set_status is defined as:

  @spec set_status(OpenTelemetry.status()) :: boolean()
  def set_status(status) do
    :otel_span.set_status(:otel_tracer.current_span_ctx(), status)
  end

Shouldn't this function accept an optional description message? (https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#set-status)

[bryannaegele]

@dvic you aren't allowed to set descriptions on non-error statuses. When you create an error status with an optional message, it is set appropriately on the span.

More info in #246 if you want to see the details.

[tsloughter]

But also the status is a record, so you must first create the status with OpenTelemetry.status/2 and then pass it to set_status.