span.kind had producer and consumer now

api/src/main/java/openconsensus/trace/Span.java

@@ -173,6 +173,24 @@ public abstract class Span {
      *
      * @since 0.1.0
      */
-    CLIENT
+    CLIENT,
+
+    /**
+     * Indicates that the span describes producer sending a message to a broker. Unlike client and
+     * server, there is no direct critical path latency relationship between producer and consumer
+     * spans.
+     *
+     * @since 0.1.0
+     */
+    PRODUCER,
+
+    /**
+     * Indicates that the span describes consumer recieving a message from a broker. Unlike client
+     * and server, there is no direct critical path latency relationship between producer and
+     * consumer spans.
+     *
+     * @since 0.1.0
+     */
+    CONSUMER
   }
 }