一个很神奇的监控系统-Springboot+Prometheus+Grafana

一、概况：

SpringBoot项目的监控解决方案很多，各种各样，琳琅满目，但是我目前发现的解决方案中，Springboot+Prometheus+Grafana是一个非常优秀方案之一。此方案三者关系是：SpringBoot暴露指标，Prometheus负责收集，Grafana负责可视化监控和报警。

二、首先你需要一个SpringBoot项目：

1、创建SpringBoot项目的视频和指导有很多，不在此赘述，提供下pom依赖：

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>io.micrometer</groupId>
            <artifactId>micrometer-registry-prometheus</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!-- hutool  -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.5</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

2、yml配置文件：

server:
  port: 8081

spring:
  application:
    name: monitor-system
management:
  endpoints:
    web:
      exposure:
        include: "*"
  server:
    port: 9091
  metrics:
    export:
      prometheus:
        enabled: true
    tags:
      application: ${spring.application.name}

3、测试用的Controller:

@Slf4j
@RestController
public class PrometheusController {

    private static Logger logger = LoggerFactory.getLogger(SpringBootPrometheusGrafanaApplication.class);

    private Random random = new Random();

    public static final Map<String, Object> map = new ConcurrentHashMap<>();

    @Value("${spring.application.name}")
    private String applicationName;

    /**
     * 接口调用演示接口
     * @return
     */
    @GetMapping("hello")
    public String hello() {
        logger.info("name=[{}]",applicationName);
        int sleep = random.nextInt(200);
        try {
            Thread.sleep(sleep);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "hello sleep: " + sleep + " for " + applicationName;
    }
    /**
     * 内存溢出演示接口
     * @return
     */
    @GetMapping("/heap")
    public String testHeapUsed() {
        for (int i = 0; i < 10000000; i++) {
            map.put(i + "", new Object());
        }
        return "ok";
    }
}

4、Metrics 配置：

@Configuration
public class MetricsConfig {

    /**
     * 注册
     */
    @Bean
    MeterRegistryCustomizer<MeterRegistry> configurer(@Value("${spring.application.name}") String applicationName) {
        return (registry) -> registry.config().commonTags("application", applicationName);
    }

}

5、访问Metrics信息：http://localhost:9091/actuator/prometheus

三、Prometheus配置

1、官网指定下载包: Download | Prometheus

2、接入。到下图文件夹路径下，找到 prometheus.yml 。

修改配置信息

# my global config
global:
  scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
    - static_configs:
        - targets:
          # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: "prometheus"

    # metrics_path defaults to '/metrics'
    metrics_path: '/actuator/prometheus'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ['localhost:9091']

3、启动 Prometheus 服务