jvm-metrics-example

Spring Boot jvm metrics example

This example shows how to use Actuator Metrics module with CounterService and GaugeService to the application., having: The function of this module is to use a counter or gauge to get the number of visits to the app or statistics and thresholds for a specific situation.

• Spring Actuator Metrics

• CounterService to accumulate request count

• GaugeService to detect the private threshold of process awating time

To try the example, execute this command in a terminal:

mvn clean spring-boot:run

First, you request to see your all book saved: The service job process using cpu scheduler returns a stream list of simple five books info. and Let’s assume a synchronization operation. It just await processing without using cpu. change this value.(MetricsController.java)

http://localhost:8989

You should now be able to see your request count, and also can see some warn gauge infomation if you have set enough thread block time :

http://localhost:7979/actuator/metrics

using OperatingSystemMXBean methods and options are as follows,[1]

- getProcessCpuTime : CPU time used by the process on which the Java virtual machine is running in nanoseconds.
- getSystemCpuLoad : Returns the "recent cpu usage" for the whole system.
- getProcessCpuLoad : Returns the "recent cpu usage" for the Java Virtual Machine process.
- getTotalPhysicalMemorySize : Returns the total amount of physical memory in bytes.
- getFreePhysicalMemorySize : Returns the amount of free physical memory in bytes.
- momentRatio : Percentage of moment CPU Usage Time per a Job processing time

Reference

[1]. http://nadeausoftware.com/articles/2008/03/java_tip_how_get_cpu_and_user_time_benchmarking