Alerts

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