Sort linear metric query result (#4880)

Signed-off-by: NGao Hongtao <hanahmily@gmail.com>

oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/resolver/MetricQuery.java

@@ -99,10 +99,10 @@ public class MetricQuery implements GraphQLQueryResolver {
 
         final List<MetricsValues> metricsValues = query.readLabeledMetricsValues(condition, labels, duration);
         List<IntValues> response = new ArrayList<>(metricsValues.size());
-        metricsValues.forEach(value -> {
-            response.add(value.getValues());
-        });
-
+        labels.forEach(l -> metricsValues.stream()
+            .filter(m -> m.getLabel().equals(l))
+            .findAny()
+            .ifPresent(values -> response.add(values.getValues())));
         return response;
     }
 
@@ -118,10 +118,10 @@ public class MetricQuery implements GraphQLQueryResolver {
 
         final List<MetricsValues> metricsValues = query.readLabeledMetricsValues(condition, labels, duration);
         List<IntValues> response = new ArrayList<>(metricsValues.size());
-        metricsValues.forEach(value -> {
-            response.add(value.getValues());
-        });
-
+        labels.forEach(l -> metricsValues.stream()
+            .filter(m -> m.getLabel().equals(l))
+            .findAny()
+            .ifPresent(values -> response.add(values.getValues())));
         return response;
     }