I have some code I worte a long time ago here (calculating VM performance average and maximum from start to end date) and I do not think I have the coma issue since it is displaying values < 10.
Please check if this works for you. It does for me on vCO 4.1 build 581, vC4 plug-in and vCenter 5.0
I may need to put a tutorial on this but most of my code need rework since it was done for the VIM3 plug-in.
This make me think I forgot the perl to vCO article ! 
So many think to share and so little time ...
if (performanceIds == null) performanceIds = [6,90,110,98];
var performanceManager = vm.vimHost.performanceManager;
var counters = performanceManager.queryPerfCounter(performanceIds);
var perfIdsCountersProp = new Properties();
for (var i in performanceIds) {
perfIdsCountersProp.put(performanceIds[i], counters[i].groupInfo.label + " " + counters[i].nameInfo.label + " (" + counters[i].unitInfo.label + ")");
}var perfMetricIds = new Array();
for (var i in performanceIds) {
var perfMetricId = new VcPerfMetricId();
perfMetricId.counterId = performanceIds[i];
System.log("adding perf :" + performanceIds[i]);
perfMetricId.instance = "";
perfMetricIds.push(perfMetricId);}
var perfQuerySpecs = new Array();
var perfQuerySpec = new VcPerfQuerySpec();
perfQuerySpec.entity = vm.reference;
perfQuerySpec.startTime = startDate;
perfQuerySpec.endTime = endDate;
perfQuerySpec.maxSample = 180;
perfQuerySpec.intervalId = 20;
perfQuerySpec.format = "csv";
perfQuerySpec.metricId = perfMetricIds;
perfQuerySpecs.push(perfQuerySpec);System.log("Query started");
var metrics = performanceManager.queryPerf(perfQuerySpecs);
System.log("Query finished");
if (metrics != null) {
System.log("found " + metrics.length + " metrics");
for each (var metric in metrics) {
//System.log(metric.sampleInfoCSV); // This defines the timing of the data collected
//Collecting properties Data
var prop = new Properties();
for (var c in metric.value) {
var csvLine = metric.value[c].value
var counterId = metric.value[c].id.counterId;
var label = perfIdsCountersProp.get(counterId);
var max;
var csvLineValuesNb = 0;
var csvLineValuesSum =0;
var csvLineValues = csvLine.split(",");
if (csvLineValues.length >=1) {
var max = Math.max.apply(null, csvLineValues);
for each (var csvLineValue in csvLineValues) {
csvLineValuesSum += csvLineValue * 1;
csvLineValuesNb ++;
}
var average = Math.round(csvLineValuesSum/csvLineValuesNb);
}
prop.put("Average " + label, average);
prop.put("Maximum " + label, max);
prop.put("startDate", startDate);
prop.put("endDate", endDate);
System.log("label : " + label + " max : " + max + " average : " + average);
}
return prop;
}
}
else return null;
Hi Christophe,
maybe you understand us wrong. It has nothing to do with numbers < 10. The problem are floating point numbers which are comma seperated. (The problem occurs, becausee somewhere in VCO the performance values are converted to CVS-Format which also uses comma as delimiter).
The reason you hadn't the problem is, that your scripts asks for metricID's: 6 (cpu.ugage (Mhz)) , 90 (mem.cosumed (kiloBytes)), 110 (disk.commandsAbored (number)), 98 (mem.compression kiloBytesPerSecond)). As far as I can these metrics are (unsigned) intergers. Attached you find a modified version of your script (replaced parametes,i.e. start-/endDate so the script works out of the box) which also shows the values for metricIds 2,16. (Which returns floating point numbers, see vCenter)
var performanceIds = [6,90,110,98,2,16];
var performanceManager = vm.vimHost.performanceManager;
var counters = performanceManager.queryPerfCounter(performanceIds);
var perfIdsCountersProp = new Properties();
for (var i in performanceIds) {
perfIdsCountersProp.put(performanceIds[i], counters[i].groupInfo.label + " " + counters[i].nameInfo.label + " (" + counters[i].unitInfo.label + ")");
}
var perfMetricIds = new Array();
for (var i in performanceIds) {
var perfMetricId = new VcPerfMetricId();
perfMetricId.counterId = performanceIds[i];
System.log("adding perf :" + performanceIds[i]);
perfMetricId.instance = "";
perfMetricIds.push(perfMetricId);
}
var perfQuerySpecs = new Array();
var startDate = new Date();
var endDate = new Date();
startDate.setTime(endDate.getTime() - 3600 * 1000);
var perfQuerySpec = new VcPerfQuerySpec();
perfQuerySpec.entity = vm.reference;
perfQuerySpec.startTime = startDate;
perfQuerySpec.endTime = endDate;
perfQuerySpec.maxSample = 180;
perfQuerySpec.intervalId = 20;
perfQuerySpec.format = "csv";
perfQuerySpec.metricId = perfMetricIds;
perfQuerySpecs.push(perfQuerySpec);
System.log("Query started");
var metrics = performanceManager.queryPerf(perfQuerySpecs);
System.log("Query finished");
if (metrics != null) {
System.log("found " + metrics.length + " metrics");
for each (var metric in metrics) {
//System.log(metric.sampleInfoCSV); // This defines the timing of the data collected
//Collecting properties Data
var prop = new Properties();
for (var c in metric.value) {
var csvLine = metric.value[c].value
var counterId = metric.value[c].id.counterId;
var label = perfIdsCountersProp.get(counterId);
var max;
var csvLineValuesNb = 0;
var csvLineValuesSum =0;
var csvLineValues = csvLine.split(",");
if (csvLineValues.length >=1) {
var max = Math.max.apply(null, csvLineValues);
for each (var csvLineValue in csvLineValues) {
csvLineValuesSum += csvLineValue * 1;
csvLineValuesNb ++;
}
var average = Math.round(csvLineValuesSum/csvLineValuesNb);
}
prop.put("Average " + label, average);
prop.put("Maximum " + label, max);
prop.put("startDate", startDate);
prop.put("endDate", endDate);
System.log("label : " + label + " max : " + max + " average : " + average);
}
}
}
Output:
[2011-11-09 09:12:52.052] [I] label : CPU Usage in MHz (MHz) max : 15 average : 7
[2011-11-09 09:12:52.052] [I] label : Memory Consumed (KB) max : 188744 average : 188679
[2011-11-09 09:12:52.052] [I] label : Memory Compression rate (KBps) max : 0 average : 0
[2011-11-09 09:12:52.068] [I] label : CPU Usage (Percent) max : 75 average : 33
[2011-11-09 09:12:52.068] [I] label : Memory Usage (Percent) max : 399 average : 122
The machine has a CPU Usage (Percent) Max-Value of 0,75 and an Average-Value of 3,33, not 75 and 33 like returned in the CVS-String (Developers have to change the delimiter so soemthing else, i.e. ';'). The same applies to Memory Usage (Percent).
And yes, shame on you, you forgot to create the Perl tutorial!! 
btw: How/Where can I create a bug-report for this?