可观测性-Metrics-数据库连接池HikariCP监控教程

    <dependency>
      <groupId>com.zaxxer</groupId>
      <artifactId>HikariCP</artifactId>
      <version>4.0.3</version>
    </dependency>
    <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
      <groupId>io.micrometer</groupId>
      <artifactId>micrometer-core</artifactId>
      <version>1.9.4</version>
    </dependency>

		// hikari配置       
		HikariConfig hikariConfig = new HikariConfig();
        hikariConfig.setJdbcUrl("jdbc:mysql://localhost:3306/laker?serverTimezone=GMT%2B8&characterEncoding=utf8&useSSL=false");
        hikariConfig.setUsername("root");
        hikariConfig.setPassword("123456");
        hikariConfig.setDriverClassName("com.mysql.jdbc.Driver");
        hikariConfig.setAutoCommit(true);
        hikariConfig.setPoolName("laker_poolName");
        hikariConfig.setMaximumPoolSize(10);
        hikariConfig.setMinimumIdle(3);
        // 创建HikariDataSource
        HikariDataSource dataSource = new HikariDataSource(hikariConfig);
        // 设置metric注册器 每10秒打印一次
        LoggingMeterRegistry loggingMeterRegistry = new LoggingMeterRegistry(new LoggingRegistryConfig() {
            @Override
            public String get(String key) {
                return null;
            }
            @Override
            public Duration step() {
                return Duration.ofSeconds(10);
            }
        }, Clock.SYSTEM);
        dataSource.setMetricRegistry(loggingMeterRegistry);

        // 测试 持有3秒连接后才释放
        Connection connection = dataSource.getConnection();
        TimeUnit.SECONDS.sleep(3);
        connection.close();

@Configuration
public class DatasourceConfiguration {
    @Bean
    public DataSource primaryDataSource(MetricRegistry metricRegistry) {
		HikariConfig hikariConfig = new HikariConfig();
        hikariConfig.setJdbcUrl("jdbc:mysql://localhost:3306/laker?serverTimezone=GMT%2B8&characterEncoding=utf8&useSSL=false");
        hikariConfig.setUsername("root");
        hikariConfig.setPassword("123456");
        hikariConfig.setDriverClassName("com.mysql.jdbc.Driver");
        hikariConfig.setAutoCommit(true);
        hikariConfig.setPoolName("laker_poolName");
        hikariConfig.setMaximumPoolSize(10);
        hikariConfig.setMinimumIdle(3);
        // 创建HikariDataSource
        HikariDataSource dataSource = new HikariDataSource(hikariConfig);
        dataSource.setMetricRegistry(loggingMeterRegistry);
        return dataSource;
    }
}

  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-actuator</artifactId>
  </dependency>