1.关于Prometheus

Prometheus是一个根据应用的metrics来进行监控的开源工具。相信很多工程都在使用它来进行监控，有关详细介绍可以查看官网：https://prometheus.io/docs/introduction/overview/。

2.有关Grafana

Grafana是一个开源监控利器，如图所示。

从图中就可以看出来，使用Grafana监控很高大上，提供了很多可视化的图标。

官网地址：https://grafana.com/

3.SpringBoot使用Prometheus

3.1 依赖内容

在SpringBoot中使用Prometheus其实很简单，不需要配置太多的东西，在pom文件中加入依赖，完整内容如下所示。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.3.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.dalaoyang</groupId><artifactId>springboot2_prometheus</artifactId><version>0.0.1-SNAPSHOT</version><name>springboot2_prometheus</name><description>springboot2_prometheus</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>io.micrometer</groupId><artifactId>micrometer-registry-prometheus</artifactId><version>1.1.3</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

3.2 配置文件

配置文件中加入配置，这里就只进行一些简单配置，management.metrics.tags.application属性是本文配合Grafana的Dashboard设置的，如下所示：

spring.application.name=springboot_prometheus
management.endpoints.web.exposure.include=*
management.metrics.tags.application=${spring.application.name}

3.3 设置application

修改启动类，如下所示.

@SpringBootApplication
public class Springboot2PrometheusApplication {public static void main(String[] args) {SpringApplication.run(Springboot2PrometheusApplication.class, args);}@BeanMeterRegistryCustomizer<MeterRegistry> configurer(@Value("${spring.application.name}") String applicationName) {return (registry) -> registry.config().commonTags("application", applicationName);}
}

SpringBoot项目到这里就配置完成了，启动项目，访问http://localhost:8080/actuator/prometheus，如图所示，可以看到一些度量指标。

4.Prometheus配置

4.1 配置应用

在prometheus配置监控我们的SpringBoot应用，完整配置如下所示。

# 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:- job_name: 'prometheus'static_configs:- targets: ['127.0.0.1:9090']
###以下内容为SpringBoot应用配置- job_name: 'springboot_prometheus'scrape_interval: 5smetrics_path: '/actuator/prometheus'static_configs:- targets: ['127.0.0.1:8080']