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Add support of PrometheusRawMetricsProvider for the Pulsar-Proxy (apa…
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.../main/java/org/apache/pulsar/broker/stats/prometheus/PrometheusMetricsGeneratorUtils.java
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/** | ||
* 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.pulsar.broker.stats.prometheus; | ||
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import io.netty.buffer.ByteBuf; | ||
import io.netty.buffer.ByteBufAllocator; | ||
import io.prometheus.client.Collector; | ||
import io.prometheus.client.CollectorRegistry; | ||
import java.io.IOException; | ||
import java.io.OutputStream; | ||
import java.util.Enumeration; | ||
import java.util.List; | ||
import org.apache.pulsar.common.util.SimpleTextOutputStream; | ||
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/** | ||
* Generate metrics in a text format suitable to be consumed by Prometheus. | ||
* Format specification can be found at {@link https://prometheus.io/docs/instrumenting/exposition_formats/} | ||
*/ | ||
public class PrometheusMetricsGeneratorUtils { | ||
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public static void generate(String cluster, OutputStream out, | ||
List<PrometheusRawMetricsProvider> metricsProviders) | ||
throws IOException { | ||
ByteBuf buf = ByteBufAllocator.DEFAULT.heapBuffer(); | ||
try { | ||
SimpleTextOutputStream stream = new SimpleTextOutputStream(buf); | ||
generateSystemMetrics(stream, cluster); | ||
if (metricsProviders != null) { | ||
for (PrometheusRawMetricsProvider metricsProvider : metricsProviders) { | ||
metricsProvider.generate(stream); | ||
} | ||
} | ||
out.write(buf.array(), buf.arrayOffset(), buf.readableBytes()); | ||
} finally { | ||
buf.release(); | ||
} | ||
} | ||
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public static void generateSystemMetrics(SimpleTextOutputStream stream, String cluster) { | ||
Enumeration<Collector.MetricFamilySamples> metricFamilySamples = | ||
CollectorRegistry.defaultRegistry.metricFamilySamples(); | ||
while (metricFamilySamples.hasMoreElements()) { | ||
Collector.MetricFamilySamples metricFamily = metricFamilySamples.nextElement(); | ||
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// Write type of metric | ||
stream.write("# TYPE ").write(metricFamily.name).write(' ') | ||
.write(getTypeStr(metricFamily.type)).write('\n'); | ||
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for (int i = 0; i < metricFamily.samples.size(); i++) { | ||
Collector.MetricFamilySamples.Sample sample = metricFamily.samples.get(i); | ||
stream.write(sample.name); | ||
stream.write("{cluster=\"").write(cluster).write('"'); | ||
for (int j = 0; j < sample.labelNames.size(); j++) { | ||
String labelValue = sample.labelValues.get(j); | ||
if (labelValue != null) { | ||
labelValue = labelValue.replace("\"", "\\\""); | ||
} | ||
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stream.write(","); | ||
stream.write(sample.labelNames.get(j)); | ||
stream.write("=\""); | ||
stream.write(labelValue); | ||
stream.write('"'); | ||
} | ||
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stream.write("} "); | ||
stream.write(Collector.doubleToGoString(sample.value)); | ||
stream.write('\n'); | ||
} | ||
} | ||
} | ||
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static String getTypeStr(Collector.Type type) { | ||
switch (type) { | ||
case COUNTER: | ||
return "counter"; | ||
case GAUGE: | ||
return "gauge"; | ||
case SUMMARY : | ||
return "summary"; | ||
case HISTOGRAM: | ||
return "histogram"; | ||
case UNTYPED: | ||
default: | ||
return "untyped"; | ||
} | ||
} | ||
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} | ||
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...r-broker-common/src/main/java/org/apache/pulsar/broker/stats/prometheus/package-info.java
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/** | ||
* 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.pulsar.broker.stats.prometheus; |
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