This tiny library provides a simply metric for garbage collection usage:
the percentage of time that the JVM spends collecting garbage.
The health check will report HEALTHY, if the percentage is below a specified threshold and UNHEALTHY otherwise.
The GC percentage is calculated based on the last health check access time. Thus, you most likely get false positives when checking too often. Checking the health every few seconds should suffice.
The calculations use some static properties. Thus you can only instantiate one GCHealthCheck. If you are using CDI, you can simply use a Producer as follows:
@ApplicationScoped
public class HealthCheck {
private GCHealthCheck gcHealthCheck = null;
@Produces
public GCHealthCheck produceGCHealthCheck() {
return gcHealthCheck;
}
@PostConstruct
public void init() {
int threshold = 20;
gcHealthCheck = GCHealthCheck.init(threshold);
}
}