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

    https://github.com/apache/incubator-brooklyn/pull/650#discussion_r30615966
  
    --- Diff: 
core/src/main/java/brooklyn/event/feed/windows/WindowsPerformanceCounterFeed.java
 ---
    @@ -98,10 +104,11 @@
         // This pattern matches CSV line(s) with the date in the first field, 
and at least one further field.
         protected static final Pattern lineWithPerfData = 
Pattern.compile("^\"[\\d:/\\-. ]+\",\".*\"$", Pattern.MULTILINE);
         private static final Joiner JOINER_ON_SPACE = Joiner.on(' ');
    +    private static final Joiner JOINER_ON_COMMA = Joiner.on(',');
     
         @SuppressWarnings("serial")
    -    public static final 
ConfigKey<Set<WindowsPerformanceCounterPollConfig<?>>> POLLS = 
ConfigKeys.newConfigKey(
    -            new TypeToken<Set<WindowsPerformanceCounterPollConfig<?>>>() 
{},
    +    public static final 
ConfigKey<List<WindowsPerformanceCounterPollConfig<?>>> POLLS = 
ConfigKeys.newConfigKey(
    --- End diff --
    
    Could/should we use Collection rather than List?


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