promethues监控tomcat：
下载网址：
https://github.com/prometheus/jmx_exporter 点击download the jar链接
https://github.com/prometheus/jmx_exporter/blob/master/exsample_configs/tomcat.yml 复制内容另存为config.xml
mkdir /var/lib/tomcat7/prometheus
cp -rv jmx_prometheus_javaagent-0.3.1.jar /var/lib/tomcat7/prometheus/
cp -rv config.xml /var/lib/tomcat7/prometheus/
chown tomcat7:tomcat7 /var/lib/tomcat7/prometheus -R
vi /etc/default/tomcat7
JAVA_OPTS="-Djava.awt.headless=true -Xmx1028m -XX:+UseConcMarkSweepGC -javaagent:/var/lib/tomcat7/prometheus/jmx_prometheus_javaagent-0.3.1.jar=9151:/var/lib/tomcat7/prometheus/config.xml"
:wq
/etc/init.d/tomcat7 restart
浏览器访问：http://ip:9151/metrics
prometheus:
vi /space/prometheus/prometheus.yml
- targets: ['host01:9151']:wq
grafana面板：
显示总heap内存：
jvm_memory_bytes_max{area='heap',instance="$node:9151"}
显示已使用heap内存：
jvm_memory_bytes_used{area='heap',instance="$node:9151"}