startGlobalSpan method
Starts a global custom span on the native SDK. Returns null if the SDK
refuses (e.g. another global span is active).
Implementation
Future<Map<String, dynamic>?> startGlobalSpan({
required String name,
Map<String, dynamic>? labels,
required List<String> ignoredInstruments,
}) {
throw UnimplementedError('startGlobalSpan() has not been implemented.');
}