Adjust the services and add comments.

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

@@ -6,8 +6,26 @@ type Query {
   version: String
 }
 
+# The Duration defines the start and end time for each query operation.
+# Fields: `start` and `end`
+#   represents the time span. And each of them matches the step.
+#   ref https://www.ietf.org/rfc/rfc3339.txt
+#   The time formats are
+#       `SECOND` step: yyyy-MM-dd HHmmss
+#       `MINUTE` step: yyyy-MM-dd HHmm
+#       `HOUR` step: yyyy-MM-dd HH
+#       `DAY` step: yyyy-MM-dd
+#       `MONTH` step: yyyy-MM
+# Field: `step`
+#   represents the accurate time point.
+# e.g.
+#   if step==HOUR , start=2017-11-08 09, end=2017-11-08 19
+#   then
+#       metrics from the following time points expected
+#       2017-11-08 9:00 -> 2017-11-08 19:00
+#       there are 11 time points (hours) in the time span.
 type Duration{
-  start: String!  # https://www.ietf.org/rfc/rfc3339.txt
+  start: String!
   end: String!
   step: Step!
 }

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

@@ -1,36 +1,66 @@
+# The overview topology of the whole application cluster,
+# which includes all applications and dependencies, e.g. MQ, Database, Cache, outside Web Service
 type ApplicationTopology {
   nodes: [Node]!
-  edges: [Edge]
+  calls: [Call]
   duration: Duration!
 }
 
+# The base Node of all node types in topology
 interface Node {
+  # The global id of each node,
+  # 1. `Application ID` represents application under monitoring
+  # 2. `Peer ID` string represents the conjectural dependency.
   id: ID!
+  # Application Code or literal Peer
   name: String!
+  # The type name
+  # 1. The most important component in the application, from service provider perspective.
+  # 2. Conjectural dependent component, e.g. MySQL, Redis, Kafka
   type: String
 }
 
+# ApplicationNode represents this node is under monitoring by agent.
 type ApplicationNode implements Node {
   id: ID!
   name: String!
   type: String
+  # Success rate of all incoming requests.
+  # Max value is 100.
+  # 2 Digits after floating point.
   sla: Float!
+  # The number of incoming calls
   calls: Long!
+  # ref: http://www.apdex.org/
+  # Max value is 1
+  # 2 Digits after floating point.
   apdex: Float!
-  totalInstance: Int!
-  totalAlert: Int!
+  # The number of servers in the application code
+  numOfServer: Int!
+  # The number of servers alerting
+  numOfServerAlarm: Int!
+  # The number of services alerting
+  numOfServiceAlarm: Int!
 }
 
-type ResourceNode implements Node {
+# The conjectural node generated by exit span
+type ConjecturalNode implements Node {
   id: ID!
   name: String!
   type: String
 }
 
-type Edge {
+# The Call represents a directed distributed call,
+# from the `source` to the `target`.
+type Call {
   source: ID!
   target: ID!
   isAlert: Boolean
+  # The protocol and tech stack used in this distributed call
+  callType: String!
+  callsPerSec: Int!
+  # Unit: millisecond
+  responseTimePerSec: Int!
 }
 
 extend type Query {