<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Observability with Prometheus · Apache Heron</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="&lt;!--"/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Observability with Prometheus · Apache Heron"/><meta property="og:type" content="website"/><meta property="og:url" content="https://heron.apache.org/"/><meta property="og:description" content="&lt;!--"/><meta property="og:image" content="https://heron.apache.org/img/undraw_online.svg"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://heron.apache.org/img/undraw_tweetstorm.svg"/><link rel="shortcut icon" href="/img/favicon-32x32.png"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><link rel="alternate" type="application/atom+xml" href="https://heron.apache.org/blog/atom.xml" title="Apache Heron Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://heron.apache.org/blog/feed.xml" title="Apache Heron Blog RSS Feed"/><script>
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<p>You can integrate Heron with <a href="https://prometheus.io/">Prometheus</a> to monitor and gather runtime metrics exported by Heron topologies.</p>
<h2><a class="anchor" aria-hidden="true" id="exporting-topology-metrics-from-heron-to-prometheus"></a><a href="#exporting-topology-metrics-from-heron-to-prometheus" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Exporting topology metrics from Heron to Prometheus</h2>
<p>Heron supports custom metric exporters from the Metrics Manager. You can either build your own Prometheus metrics sink or use the <a href="extending-heron-metric-sink">provided Prometheus sink</a>.</p>
<p>To set up your Heron cluster to export to Prometheus, you need to make two changes to the <code>metrics_sinks.yaml</code> configuration file:</p>
<ul>
<li>Add <code>prometheus-sink</code> to the <code>sinks</code> list</li>
<li>Add a <code>prometheus-sink</code> map to the file that sets values for the <a href="#prometheus-parameters">parameters</a> listed below. You can uncomment the existing <code>prometheus-sink</code> map to get the default configuration.</li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="prometheus-parameters"></a><a href="#prometheus-parameters" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Prometheus parameters</h3>
<table>
<thead>
<tr><th style="text-align:left">Parameter</th><th style="text-align:left">Description</th><th style="text-align:left">Default</th></tr>
</thead>
<tbody>
<tr><td style="text-align:left"><code>class</code></td><td style="text-align:left">The Java class used to control Prometheus sink behavior</td><td style="text-align:left"><a href="/api/org/apache/heron/metricsmgr/sink/PrometheusSink.html"><code>org.apache.heron.metricsmgr.sink.PrometheusSink</code></a></td></tr>
<tr><td style="text-align:left"><code>port</code></td><td style="text-align:left">The port on which Prometheus will scrape for metrics. <strong>Note</strong>: You must supply a <code>port</code> <em>or</em> <code>port-file</code> config.</td><td style="text-align:left">8080</td></tr>
<tr><td style="text-align:left"><code>port-file</code></td><td style="text-align:left">The path to a text file that contains the port number to be used by Prometheus for metrics scraping. <strong>Note</strong>: You must supply a <code>port</code> <em>or</em> <code>port-file</code> config.</td><td style="text-align:left"><code>metrics.port</code></td></tr>
<tr><td style="text-align:left"><code>path</code></td><td style="text-align:left">The Prometheus path on which to publish metrics</td><td style="text-align:left"><code>/metrics</code></td></tr>
<tr><td style="text-align:left"><code>include-topology-name</code></td><td style="text-align:left">Whether the name of the Heron topology will be included in names for metrics</td><td style="text-align:left"><code>true</code></td></tr>
<tr><td style="text-align:left"><code>metrics-cache-max-size</code></td><td style="text-align:left">The maximum number of metrics cached and published</td><td style="text-align:left">1000000</td></tr>
<tr><td style="text-align:left"><code>metrics-cache-ttl-sec</code></td><td style="text-align:left">The time to live (TTL) for metrics, i.e. the time, in seconds after which a metric that was collected will stop being published</td><td style="text-align:left">600 (10 minutes)</td></tr>
</tbody>
</table>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/next/cluster-config-tmanager"><span class="arrow-prev">← </span><span>Topology Manager</span></a><a class="docs-next button" href="/docs/next/observability-graphite"><span>Graphite</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#exporting-topology-metrics-from-heron-to-prometheus">Exporting topology metrics from Heron to Prometheus</a><ul class="toc-headings"><li><a href="#prometheus-parameters">Prometheus parameters</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><div class="apache-disclaimer">Apache Heron is an effort undergoing incubation at <a target="_blank" href="https://apache.org/">The Apache Software Foundation (ASF)</a> sponsored by the Apache Incubator PMC. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.<br/><br/>Apache®, the names of Apache projects, and the feather logo are either <a rel="external" href="https://www.apache.org/foundation/marks/list/">registered trademarks or trademarks</a> of the Apache Software Foundation in the United States and/or other countries.<br/><br/><div class="copyright-box">Copyright © 2023 the Apache Software Foundation, Apache Heron, Heron, 
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