leizhiyuan commented on issue #11626:
URL: https://github.com/apache/pulsar/issues/11626#issuecomment-895966458
org.apache.pulsar.functions.worker.WorkerStatsManager#writeMetric
```
for (int i = 0; i < metricsLabelNames.length; i++) {
stream.write(metricsLabelNames[i]);
stream.write('=');
stream.write('\"');
stream.write(metricsLabels[i]);
stream.write("\",");
}
```
write a comma in the last line.
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