Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2363#discussion_r77527444
  
    --- Diff: 
flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/metrics/MetricStore.java
 ---
    @@ -35,109 +46,111 @@
        final Map<String, TaskManagerMetricStore> taskManagers = new 
HashMap<>();
        final Map<String, JobMetricStore> jobs = new HashMap<>();
     
    -   /**
    -    * Adds a metric to this MetricStore.
    -    *
    -    * @param name  the metric identifier
    -    * @param value the metric value
    -    */
    -   public void add(String name, Object value) {
    -           TaskManagerMetricStore tm;
    -           JobMetricStore job;
    -           TaskMetricStore task;
    -
    +   public void add(MetricDump metric) {
                try {
    -                   String[] components = name.split(":");
    -                   switch (components[0]) {
    -                           /**
    -                            * JobManagerMetricStore metric
    -                            * format: 0:<user_scope>.<name>
    -                            */
    -                           case "0":
    -                                   jobManager.metrics.put(components[1], 
value);
    -                                   break;
    -                           /**
    -                            * TaskManager metric
    -                            * format: 1:<tm_id>:<user_scope>.<name>
    -                            */
    -                           case "1":
    -                                   if (components.length != 3) {
    -                                           break;
    -                                   }
    -                                   tm = taskManagers.get(components[1]);
    +                   QueryScopeInfo info = metric.scopeInfo;
    +                   TaskManagerMetricStore tm;
    +                   JobMetricStore job;
    +                   TaskMetricStore task;
    +
    +                   String name = info.scope.isEmpty()
    +                           ? metric.name
    +                           : info.scope + "." + metric.name;
    +                   
    +                   if (name.isEmpty()) { // malformed transmission
    +                           return;
    +                   }
    +
    +                   switch (info.getCategory()) {
    +                           case INFO_CATEGORY_JM:
    --- End diff --
    
    What's the benefit of having an explicit type field over using 
`instanceof`? I think encoding the type via the actual type has the advantage 
that you don't mix up classes with wrong category types.


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