Apache Kafka consumer lag checking

 Burrow is a monitoring companion for Apache Kafka that provides
 consumer lag checking as a service without the need for specifying
 thresholds. It monitors committed offsets for all consumers and
 calculates the status of those consumers on demand.
 .
 An HTTP endpoint is provided to request status on demand,
 as well as provide other Kafka cluster information.
 .
 There are also configurable notifiers that can send status out
 via email or HTTP calls to another service.