2018-11-13 12:38:37 -05:00
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2015-05-05 17:07:32 -04:00
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---
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layout: doc_page
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2018-12-12 23:42:12 -05:00
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title: "Druid Alerts"
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2015-05-05 17:07:32 -04:00
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---
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# Druid Alerts
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Druid generates alerts on getting into unexpected situations.
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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.
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All Druid alerts share a common set of fields:
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* `timestamp` - the time the alert was created
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* `service` - the service name that emitted the alert
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* `host` - the host name that emitted the alert
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* `severity` - severity of the alert e.g. anomaly, component-failure, service-failure etc.
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* `description` - a description of the alert
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* `data` - if there was an exception then a JSON object with fields `exceptionType`, `exceptionMessage` and `exceptionStackTrace`
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