Remove alarm trend, add metricsSnapshot and name for message (#143)

Author: wankai123

alarm.graphqls

@@ -14,18 +14,29 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-#  the trend alarm trigger times
-type AlarmTrend {
-    numOfAlarm: [Int]!
+type MQEMetric {
+    name: String!
+    results: [MQEValues!]!
+}
+
+type AlarmSnapshot {
+    # The MQE expression of the alarm rule.
+    expression: String!
+    # The metrics snapshot
+    metrics: [MQEMetric!]!
 }
 
 type AlarmMessage {
     startTime: Long!
     scope: Scope
     id: ID!
+    # The entity name of the alarm triggered.
+    name: String!
     message: String!
     events: [Event!]!
     tags: [KeyValue!]!
+    # The snapshot when the alarm triggered.
+    snapshot: AlarmSnapshot!
 }
 
 type Alarms {
@@ -38,7 +49,6 @@ input AlarmTag {
 }
 
 extend type Query {
-    getAlarmTrend(duration: Duration!): AlarmTrend!
     getAlarm(duration: Duration!, scope: Scope, keyword: String, paging: Pagination!, tags: [AlarmTag]): Alarms
     # Read the list of searchable keys
     queryAlarmTagAutocompleteKeys(duration: Duration!):[String!]