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<p>You can integrate Heron with <a href="https://github.com/facebookarchive/scribe/wiki">Scribe</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-scribe"></a><a href="#exporting-topology-metrics-from-heron-to-scribe" 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 Scribe</h2>
<p>Heron supports custom metric exporters from the Metrics Manager. You can either build your own Scribe metrics sink or use the <a href="extending-heron-metric-sink">provided Scribe sink</a>.</p>
<p>To set up your Heron cluster to export to Scribe, you need to make two changes to the <code>metrics_sinks.yaml</code> configuration file:</p>
<ul>
<li>Add <code>scribe-sink</code> to the <code>sinks</code> list</li>
<li>Add a <code>scribe-sink</code> map to the file that sets values for the <a href="#scribe-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="scribe-parameters"></a><a href="#scribe-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>Scribe 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/ScribeSink.html"><code>org.apache.heron.metricsmgr.sink.ScribeSink</code></a></td></tr>
<tr><td style="text-align:left"><code>flush-frequency-ms</code></td><td style="text-align:left">How frequently, in milliseconds, the <code>flush()</code> method is called</td><td style="text-align:left">60000 (one minute)</td></tr>
<tr><td style="text-align:left"><code>sink-restart-attempts</code></td><td style="text-align:left">How many times Heron should attempt to publish metrics to Scribe before no longer attempting</td><td style="text-align:left">-1 (forever)</td></tr>
<tr><td style="text-align:left"><code>scribe-host</code></td><td style="text-align:left">The Scribe host to export metrics to</td><td style="text-align:left">127.0.0.1</td></tr>
<tr><td style="text-align:left"><code>scribe-port</code></td><td style="text-align:left">The Scribe port to export metrics to</td><td style="text-align:left">1463</td></tr>
<tr><td style="text-align:left"><code>scribe-category</code></td><td style="text-align:left">The Scribe category to export metrics to</td><td style="text-align:left"><code>scribe-category</code></td></tr>
<tr><td style="text-align:left"><code>service-namespace</code></td><td style="text-align:left">The service name for the category in <code>scribe-category</code></td><td style="text-align:left"><code>heron</code></td></tr>
<tr><td style="text-align:left"><code>scribe-timeout-ms</code></td><td style="text-align:left">The timeout, in millisconds, when attempting to export metrics to Scribe</td><td style="text-align:left">200</td></tr>
<tr><td style="text-align:left"><code>scribe-connect-server-attempts</code></td><td style="text-align:left">The maximum number of retry attempts when connecting to Scribe on the configured host and port</td><td style="text-align:left">2</td></tr>
<tr><td style="text-align:left"><code>scribe-retry-attempts</code></td><td style="text-align:left">The maximum number of retry attempts when writing metrics to Scribe</td><td style="text-align:left">5</td></tr>
<tr><td style="text-align:left"><code>scribe-retry-interval-ms</code></td><td style="text-align:left">The time interval, in milliseconds, at which Heron attempts to write metrics to Scribe</td><td style="text-align:left">100</td></tr>
</tbody>
</table>
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