Make the user node as an extend of Node, rather then an attribute of ApplicationNode.

apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/application-layer.graphqls

@@ -8,7 +8,9 @@ type ApplicationNode implements Node {
     # 2 Digits after floating point.
     sla: Float!
     # The number of incoming calls
-    calls: Long!
+    callsPerSec: Long!
+    # Unit: millisecond
+    responseTimePerSec: Int!
     # ref: http://www.apdex.org/
     # Max value is 1
     # 2 Digits after floating point.
@@ -19,9 +21,6 @@ type ApplicationNode implements Node {
     numOfServerAlarm: Int!
     # The number of services alerting
     numOfServiceAlarm: Int!
-    # Incoming request node, means User or outside system access the cluster from this.
-    # Recommend the UI generate a User node for each incoming node
-    isIncomingNode: Boolean
 }
 
 # The conjectural node generated by exit span

apm-protocol/apm-ui-protocol/src/main/resources/ui-graphql/common.graphqls

@@ -87,6 +87,12 @@ interface Node {
     type: String
 }
 
+# Incoming request node, means User or outside system access the cluster from this.
+type VisualUserNode implements Node {
+    id: ID!
+    name: String
+}
+
 # The Call represents a directed distributed call,
 # from the `source` to the `target`.
 type Call {