class ElasticAPM::Instrumenter

def start_span(
  name,
  type = nil,
  subtype: nil,
  action: nil,
  backtrace: nil,
  context: nil,
  trace_context: nil
)
  return unless (transaction = current_transaction)
  return unless transaction.sampled?
  transaction.inc_started_spans!
  if transaction.max_spans_reached?
    transaction.inc_dropped_spans!
    return
  end
  parent = current_span || transaction
  span = Span.new(
    name: name,
    subtype: subtype,
    action: action,
    transaction: transaction,
    parent: parent,
    trace_context: trace_context,
    type: type,
    context: context,
    stacktrace_builder: stacktrace_builder
  )
  if backtrace && transaction.config.span_frames_min_duration?
    span.original_backtrace = backtrace
  end
  current_spans.push span
  span.start
end