深入浅出理解kafka原理系列之：kafka延迟检测kafka_consumergroup_lag_sum
kafka的jmx指标kafka_consumergroup_lag_sum
- kafka_consumergroup_lag_sum：查看kafka的topic消费积压的值
- kafka_consumergroup_lag_sum{consumergroup=“optics-stg”,topic=“debezium-stg-optics”} 0
- 默认值500，消费者消费kafka topic产生消费延迟
