spring cloud config server crashed when called /health endpoint frequently - crash

Question

I deployed a spring cloud config server on cloud Foundry. To get its health status in real time, I called its /health endpoint every minute. But after a few days later, config server crashed(out of memory). The chart of memory usage shows that the percentage of memory usage increased stably until it reached 100%. if I did not call /health endpoint so frequently, it ran normally. There seemed to be memory leak. Why did this happened?
this is the pom.xml file of config server maven project:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
this is the only java code in the config server project:
#EnableConfigServer
#SpringBootApplication
public class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class, args);
}
}
this is the application.properties file in the config server project:
spring.application.name=config-server
spring.cloud.config.server.git.uri=https://github.com/***/config-server-test
spring.cloud.config.server.git.username=zhu*****
spring.cloud.config.server.git.password=****