System.Diagnostics.Metrics.AggregatorLookupFunc<TAggregator> sealed delegate AggregatorLookupFunc<TAggregator> : MulticastDelegate Documentation Code namespace System.Diagnostics.Metrics { internal delegate bool AggregatorLookupFunc<TAggregator> (ReadOnlySpan<KeyValuePair<string, object>> labels, out TAggregator aggregator); }