安装kafka、prometheus
下载jmx exporter以及配置文件。Jmx exporter中包含了kafka各个组件的指标，如server metrics、producer metrics、consumer metrics等，但这些指标并不是prometheus格式的，因此需要通过重命名方式转变为prometheus格式，重命名规则配置在kafka-2_0_0.yml中。
wget https://repo1.maven.org/maven2/io/prometheus/jmx/jmx_prometheus_javaagent/0.12.0/jmx_prometheus_javaagent-0.12.0.jar wget https://raw.githubusercontent.com/prometheus/jmx_exporter/master/example_configs/kafka-2_0_0.yml
启用的方式比较简单，只需要在kafka-server-start.sh中添加如下两行即可：
...
#添加如下两行
export JMX_PORT="7081"
export KAFKA_OPTS="-javaagent:/Users/charlie.liu/kafka_2.13-3.2.3/monitor/jmx_prometheus_javaagent-0.12.0.jar=7072:/Users/charlie.liu/kafka_2.13-3.2.3/monitor/kafka-2_0_0.yml"
COMMAND=$1
case $COMMAND in
-daemon)
EXTRA_ARGS="-daemon "$EXTRA_ARGS
shift
;;
*)
;;
esac
exec $base_dir/kafka-run-class.sh $EXTRA_ARGS kafka.Kafka "$@"
prometheus的配置文件如下，启动之后即可看到kafka的指标：
global:
scrape_interval: 15s
scrape_configs:
- job_name: "kafka-cluster"
static_configs:
- targets: ["localhost:7072"]
kafka的producer metrics和consumer metrics的格式与kafka server metrics的格式不同，因此需要特定的重命名配置，可以将其追加到kafka-2_0_0.yml文件中：
# MBean: kafka.producer:type=producer-metrics,client-id=([-.w]+)
- pattern: kafka.(.*)<type=(.*)-metrics, client-id=(.*)><>(.+):\w*
name: kafka_$2-metrics
labels:
client_id: "$3"
attr_name: "$4"
help: "Kafka global client JMX metric $1 $2-metrics"
type: GAUGE
# MBean: kafka.producer:type=producer-node-metrics,client-id=([-.w]+),node-id=([0-9]+)
# MBean: kafka.consumer:type=consumer-node-metrics,client-id=([-.w]+),node-id=([0-9]+)
- pattern: kafka.(.*)<type=(.*)-metrics, client-id=(.*), node-id=(.*)><>(.+):\w*
name: kafka_$2_$5-metrics
labels:
client_id: "$3"
node_id: "$4"
attr_name: "$5"
help: "Kafka client JMX metric $1 $2-metrics"
type: GAUGE
- pattern: kafka.(.*)<type=(.*)-metrics, client-id=(.*), topic=(.*)><>(.+):\w*
name: kafka_$2_$5-metrics
labels:
client_id: "$3"
topic: "$4"
attr_name: "$5"
help: "Kafka client JMX metric $1 $2-metrics"
type: GAUGE
使用如下方式启动consumer，
KAFKA_OPTS="-javaagent:/kafka_2.13-3.2.3/monitor/jmx_prometheus_javaagent-0.12.0.jar=7073:/kafka_2.13-3.2.3/monitor/kafka-2_0_0.yml" kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic charlie-test1 --from-beginning
并在prometheus的配置文件中添加consumer target，reload prometheus 配置即可发现consumer的指标，producer的指标采集与consumer类似。
global:
scrape_interval: 15s
scrape_configs:
- job_name: "kafka-cluster"
static_configs:
- targets: ["localhost:7072"]
- job_name: "kafka-consumer"
static_configs:
- targets: ["localhost:7073"]
官方给出了Jmx exporter的其他例子。
注：由于不同的配置Jmx exporter生成的kafka指标名称是不一样的，因此并没有统一的kafka grafana dashboard，最好还是自己绘制。
