[GitHub] [pulsar] asafm commented on a diff in pull request #15558: [fix][broker][functions-worker] Ensure prometheus metrics are grouped by type (#8407, #13865)

[GitBox <gi...@apache.org>]

asafm commented on code in PR #15558:
URL: https://github.com/apache/pulsar/pull/15558#discussion_r898048085


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/prometheus/metrics/PrometheusTextFormatUtil.java:
##########
@@ -141,29 +140,32 @@ private static void writeSum(Writer w, DataSketchesOpStatsLogger opStat, String
                 .append(Double.toString(opStat.getSum(success))).append('\n');
     }
 
-    public static void writeMetricsCollectedByPrometheusClient(Writer w, CollectorRegistry registry)
-            throws IOException {
-        Enumeration<MetricFamilySamples> metricFamilySamples = registry.metricFamilySamples();
-        while (metricFamilySamples.hasMoreElements()) {
-            MetricFamilySamples metricFamily = metricFamilySamples.nextElement();
-
-            for (int i = 0; i < metricFamily.samples.size(); i++) {
-                Sample sample = metricFamily.samples.get(i);
-                w.write(sample.name);
-                w.write('{');
-                for (int j = 0; j < sample.labelNames.size(); j++) {
-                    if (j != 0) {
-                        w.write(", ");
+    public static void writeMetrics(SimpleTextOutputStream stream, Collection<MetricFamilySamples> familySamples) {
+        for (MetricFamilySamples familySample : familySamples) {
+            stream.write("# TYPE ");
+            stream.write(familySample.name);
+            stream.write(' ');
+            stream.write(familySample.type.name().toLowerCase());
+            stream.write('\n');
+            for (Collector.MetricFamilySamples.Sample sample : familySample.samples) {
+                stream.write(sample.name);
+                if (sample.labelNames.size() > 0) {
+                    stream.write('{');
+                    for (int i = 0; i < sample.labelNames.size(); ++i) {
+                        stream.write(sample.labelNames.get(i));
+                        stream.write("=\"");
+                        stream.write(sample.labelValues.get(i));
+                        stream.write("\",");
                     }
-                    w.write(sample.labelNames.get(j));
-                    w.write("=\"");
-                    w.write(sample.labelValues.get(j));
-                    w.write('"');
+                    stream.write('}');
                 }
-
-                w.write("} ");
-                w.write(Collector.doubleToGoString(sample.value));
-                w.write('\n');
+                stream.write(' ');
+                stream.write(sample.value);

Review Comment:
   Don't forget to use the method used previously
   ```  /**
      * Convert a double to its string representation in Go.
      */
     public static String doubleToGoString(double d) {
       if (d == Double.POSITIVE_INFINITY) {
         return "+Inf";
       } 
       if (d == Double.NEGATIVE_INFINITY) {
         return "-Inf";
       }
       if (Double.isNaN(d)) {
         return "NaN";
       }
       return Double.toString(d);
     }
   ```



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