Provide v2 of endpoint topology query. In order to make the UI could query...

Provide v2 of endpoint topology query. In order to make the UI could query metrics for the endpoint  dependencies in v2.

topology.graphqls

@@ -26,6 +26,12 @@ type ServiceInstanceTopology {
     calls: [Call!]!
 }
 
+# The endpoint topology
+type EndpointTopology {
+    nodes: [EndpointNode!]!
+    calls: [Call!]!
+}
+
 # Node in Topology
 type Node {
     # The global id of each node,
@@ -46,7 +52,25 @@ type Node {
 type ServiceInstanceNode {
     # The instance id of each node,
     id: ID!
-    # The literal name of the #id.
+    # The literal name of the #id. Instance Name.
+    name: String!
+    # Service id
+    serviceId: ID!
+    # The literal name of the #serviceId.
+    serviceName: String!
+    # The type name may be
+    # 1. The service provider/middleware tech, such as: Tomcat, SpringMVC
+    # 2. Conjectural Service, e.g. MySQL, Redis, Kafka
+    type: String
+    # It is a conjuecture node or real node, to represent an instance.
+    isReal: Boolean!
+}
+
+# Node in EndpointTopology
+type EndpointNode {
+    # The instance id of each node,
+    id: ID!
+    # The literal name of the #id. Endpoint Name
     name: String!
     # Service id
     serviceId: ID!
@@ -93,4 +117,6 @@ extend type Query {
     getServiceInstanceTopology(clientServiceId: ID!, serverServiceId: ID!, duration: Duration!): ServiceInstanceTopology
     # Query the topology, based on the given endpoint
     getEndpointTopology(endpointId: ID!, duration: Duration!): Topology
+    # v2 of getEndpointTopology
+    getEndpointDependencies(endpointId: ID!, duration: Duration!): EndpointTopology
 }