Developing Java Applications with Spring and Spring Boot

Metrics

To really get operational, we need metrics. Most production systems have metrics in one form or another. Thankfully, we don't have to start from scratch. There is a metric endpoint in Spring Boot Actuator. If we add this following setting to application.properties:

    endpoints.metrics.enabled=true

With this property setting, if we restart the application, we can get a quick read out on thing.

Assuming we have JSON Viewer installed, it's easy to surf to http://localhost:9000/application/metrics and get a listing on all sorts of metrics. We even have counters for every good/bad web hit, broken down on a per-page basis, as shown here:

    {      "names": [        "jvm.buffer.memory.used",        "jvm.memory.used",        "jvm.buffer.count",        "logback.events", "process.uptime", ...