def _tracing_information():
    """Gets B3 distributed tracing information, if available.
     This is returned as a list, ready to be formatted into Spring Cloud Sleuth compatible format.
     """

    # We'll collate trace information if the B3 headers have been collected:
    values = b3.values()
    if values[b3.b3_trace_id]:
        # Trace information would normally be sent to Zipkin if either of sampled or debug ("flags") is set to 1
        # However we're not currently using Zipkin, so it's always false
        # exported = "true" if values[b3.b3_sampled] == '1' or values[b3.b3_flags] == '1' else "false"

        return [
            current_app.name if current_app.name else " - ",
            values[b3.b3_trace_id],
            values[b3.b3_span_id],
            "false",
        ]