added some comments on the server side

server/rx/extensions.go

@@ -6,6 +6,9 @@ import "time"
 //
 // Debounce emits the most recently emitted value from the source
 // withing the timespan set by the span time.Duration
+//
+// Soon it will be deprecated since it doesn't add anything useful.
+// (It lowers the CPU usage by a negligible margin)
 func Sample(span time.Duration, source chan []byte, done chan struct{}, fn func(e []byte)) {
 	var (
 		item   []byte