Simple example showing how clustering can be accomplished in ArcGIS Runtime 100.x. This example calculates the number of overlapping points an associated feature layer service has, and displays them in a graphics overlay. This sample could be altered to adjust the symbology of a feature layer, but there are performance considerations and approaches to consider.
johncdoherty/ArcGISRuntimeClustering
Simple example showing how clustering can be accomplished in ArcGIS Runtime 100.x.
C#