collectMetricFamilySamples method
Collect all metrics and samples from the registered Collectors.
Implementation
Future<Iterable<MetricFamilySamples>> collectMetricFamilySamples() async {
final metricFamilySamples =
await Future.wait(_collectorsToNames.keys.map((c) => c.collect()));
return metricFamilySamples.expand((m) => m);
}