Always separate decimals by a dot in metrics response

Author: winterhazel

plugins/metrics/src/main/java/org/apache/cloudstack/metrics/MetricsServiceImpl.java

@@ -21,10 +21,12 @@
 
 import java.lang.reflect.InvocationTargetException;
 import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Properties;
 import java.util.stream.Collectors;
@@ -461,8 +463,8 @@ protected ListResponse<VmMetricsStatsResponse> createVmMetricsStatsResponse(List
      * @return the set of responses that was created.
      */
     protected List<StatsResponse> createStatsResponse(List<VmStatsVO> vmStatsList) {
-        List<StatsResponse> statsResponseList = new ArrayList<StatsResponse>();
-        DecimalFormat decimalFormat = new DecimalFormat("#.##");
+        List<StatsResponse> statsResponseList = new ArrayList<>();
+        DecimalFormat decimalFormat = new DecimalFormat("#.##", DecimalFormatSymbols.getInstance(Locale.ENGLISH));
         for (VmStatsVO vmStats : vmStatsList) {
             StatsResponse response = new StatsResponse();
             response.setTimestamp(vmStats.getTimestamp());