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<p>Druid generates alerts on getting into unexpected situations.</p>
<p>Alerts are emitted as JSON objects to a runtime log file or over HTTP (to a service such as Apache Kafka). Alert emission is disabled by default.</p>
<p>All Druid alerts share a common set of fields:</p>
<ul>
<li><code>timestamp</code> - the time the alert was created</li>
<li><code>service</code> - the service name that emitted the alert</li>
<li><code>host</code> - the host name that emitted the alert</li>
<li><code>severity</code> - severity of the alert e.g. anomaly, component-failure, service-failure etc.</li>
<li><code>description</code> - a description of the alert</li>
<li><code>data</code> - if there was an exception then a JSON object with fields <code>exceptionType</code>, <code>exceptionMessage</code> and <code>exceptionStackTrace</code></li>
</ul>
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