[GitHub] [pulsar] hangc0276 commented on a change in pull request #6814: Expose managed ledger bookie client metric to prometheus

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

hangc0276 commented on a change in pull request #6814:
URL: https://github.com/apache/pulsar/pull/6814#discussion_r415034605



##########
File path: managed-ledger/src/main/java/org/apache/bookkeeper/mledger/stats/prometheus/PrometheusTextFormatUtil.java
##########
@@ -0,0 +1,152 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.bookkeeper.mledger.stats.prometheus;
+
+import io.prometheus.client.Collector;
+import io.prometheus.client.Collector.MetricFamilySamples;
+import io.prometheus.client.Collector.MetricFamilySamples.Sample;
+import io.prometheus.client.CollectorRegistry;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.Enumeration;
+
+import org.apache.bookkeeper.stats.Counter;
+
+/**
+ * Logic to write metrics in Prometheus text format.
+ */
+public class PrometheusTextFormatUtil {
+    static void writeGauge(Writer w, String name, SimpleGauge<? extends Number> gauge) {
+        // Example:
+        // # TYPE bookie_storage_entries_count gauge
+        // bookie_storage_entries_count 519
+        try {
+            w.append("# TYPE ").append(name).append(" gauge\n");
+            w.append(name).append(' ').append(gauge.getSample().toString()).append('\n');
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    static void writeCounter(Writer w, String name, Counter counter) {
+        // Example:
+        // # TYPE jvm_threads_started_total counter
+        // jvm_threads_started_total 59
+        try {
+            w.append("# TYPE ").append(name).append(" counter\n");
+            w.append(name).append(' ').append(counter.get().toString()).append('\n');
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    static void writeOpStat(Writer w, String name, DataSketchesOpStatsLogger opStat) {
+        // Example:
+        // # TYPE bookie_journal_JOURNAL_ADD_ENTRY summary
+        // bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.5",} NaN
+        // bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.75",} NaN
+        // bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.95",} NaN
+        // bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.99",} NaN
+        // bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.999",} NaN
+        // bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.9999",} NaN

Review comment:
       I have checked the bookie client metric code, some class constructor and functions are package private and can't be accessed in pulsar.




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