HeapMemoryHealthCheck (Helidon Project 2.6.9 API)

java.lang.Object
- io.helidon.health.checks.HeapMemoryHealthCheck

All Implemented Interfaces:

HealthCheck
```
@Liveness
@ApplicationScoped
@BuiltInHealthCheck
public class HeapMemoryHealthCheck
extends Object
implements HealthCheck
```
A health check that verifies whether the server is running out of Java heap space. If heap usage exceeds a specified threshold, then the health check will fail.
By default, this health check has a threshold of 98.0 (98.0%). If heap usage exceeds this level, then the server is considered to be unhealthy. This default can be modified using the "helidon.health.heapMemory.thresholdPercent" property. The threshold should be set as a percent, such as 50 for 50% or 99 for 99%.

This health check is automatically created and registered through CDI.

This health check can be referred to in properties as heapMemory. So for example, to exclude this health check from being exposed, use helidon.health.exclude: heapMemory.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class HeapMemoryHealthCheck.Builder
Fluent API builder for HeapMemoryHealthCheck.

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`CONFIG_KEY_THRESHOLD_PERCENT`	Config property key for heap memory threshold.
`static double`	`DEFAULT_THRESHOLD`	Default threshold percentage.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static HeapMemoryHealthCheck.Builder`	`builder()`	Create a new fluent API builder to configure a new health check.
`HealthCheckResponse`	`call()`
`static HeapMemoryHealthCheck`	`create()`	Create a new heap memory health check with default configuration.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_THRESHOLD
```
public static final double DEFAULT_THRESHOLD
```
    Default threshold percentage.
    
    See Also:
    
    Constant Field Values
  - CONFIG_KEY_THRESHOLD_PERCENT
```
public static final String CONFIG_KEY_THRESHOLD_PERCENT
```
    Config property key for heap memory threshold.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - builder
```
public static HeapMemoryHealthCheck.Builder builder()
```
    Create a new fluent API builder to configure a new health check.
    
    Returns:
    
    builder instance
  - create
```
public static HeapMemoryHealthCheck create()
```
    Create a new heap memory health check with default configuration.
    
    Returns:
    
    a new health check to register with HealthSupport.Builder.addLiveness(org.eclipse.microprofile.health.HealthCheck...)
    
    See Also:
    
    DEFAULT_THRESHOLD
  - call
```
public HealthCheckResponse call()
```
    Specified by:
    
    call in interface HealthCheck