Spring Boot Pushgateway 应用实战：完整指南

以下是一个简单的 Spring Boot Pushgateway 应用的示例代码：

创建一个 Spring Boot 项目并添加以下依赖：

<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-registry-prometheus</artifactId>
    <version>1.7.0</version>
</dependency>
<dependency>
    <groupId>io.prometheus</groupId>
    <artifactId>simpleclient_pushgateway</artifactId>
    <version>0.11.0</version>
</dependency>

在 application.properties 中添加以下配置：

management.metrics.export.prometheus.enabled=true
management.endpoints.web.exposure.include=prometheus

创建一个 controller 类来处理 Pushgateway 请求：

import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.MeterRegistry;
import io.prometheus.client.exporter.PushGateway;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PushGatewayController {
    private final MeterRegistry meterRegistry;
    private final PushGateway pushGateway;
    private final String jobName;
    private final String pushGatewayUrl;
    private final Counter counter;

    public PushGatewayController(MeterRegistry meterRegistry,
                                 @Value('${pushgateway.job-name}') String jobName,
                                 @Value('${pushgateway.url}') String pushGatewayUrl) {
        this.meterRegistry = meterRegistry;
        this.pushGateway = new PushGateway(pushGatewayUrl);
        this.jobName = jobName;
        this.pushGatewayUrl = pushGatewayUrl;
        this.counter = Counter.builder('pushgateway_demo')
                .description('A demo counter for Pushgateway')
                .tag('job', jobName)
                .register(meterRegistry);
    }

    @GetMapping('/increment')
    public String increment() {
        counter.increment();
        pushMetricsToGateway();
        return 'Counter incremented';
    }

    private void pushMetricsToGateway() {
        try {
            pushGateway.pushAdd(meterRegistry.getPrometheusRegistry().getSampleValue('pushgateway_demo', new String[]{'job'}, new String[]{jobName}));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

在 application.properties 中添加以下 Pushgateway 相关配置：

pushgateway.job-name=pushgateway-demo
pushgateway.url=http://localhost:9091

在 Pushgateway 中创建一个 job，并通过以下命令启动 Pushgateway：

docker run -d -p 9091:9091 prom/pushgateway

启动 Spring Boot 应用程序并访问 http://localhost:8080/increment 来增加计数器的值，并将指标推送到 Pushgateway。
在 Pushgateway 的 Web UI 中查看指标：http://localhost:9091/metrics。您应该能够看到来自 Spring Boot 应用程序的指标。