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YuCheng Hu 1 year ago
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      operations/alerts.md

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operations/alerts.md

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---
id: alerts
title: "Alerts"
---
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Druid generates alerts on getting into unexpected situations.
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.
All Druid alerts share a common set of fields:
* `timestamp` - the time the alert was created
* `service` - the service name that emitted the alert
* `host` - the host name that emitted the alert
* `severity` - severity of the alert e.g. anomaly, component-failure, service-failure etc.
* `description` - a description of the alert
* `data` - if there was an exception then a JSON object with fields `exceptionType`, `exceptionMessage` and `exceptionStackTrace`
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