import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ConfigurationProperties("metrics.export")
@ExportMetricWriter
public GaugeWriter openTsdbMetricWriter() {
	OpenTsdbGaugeWriter writer = new OpenTsdbGaugeWriter();
	writer.setNamingStrategy(namingStrategy());
	return writer;
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
public RedisMetricRepository redisMetricWriter(
		RedisConnectionFactory connectionFactory) {
	return new RedisMetricRepository(connectionFactory,
			this.export.getRedis().getPrefix(), this.export.getRedis().getKey());
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ConfigurationProperties("metrics.export")
@ExportMetricWriter
public MetricWriter openTsdbMetricWriter() {
	OpenTsdbMetricWriter writer = new OpenTsdbMetricWriter();
	writer.setNamingStrategy(namingStrategy());
	return writer;
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
/*
 * Prometheus is not capable to scrape json metrics so we need to expose the actuator metrics to jmx. Every
 * counter and gauge metrics are exposed too.
 */
public MetricWriter metricWriter(MBeanExporter exporter) {
    return new JmxMetricWriter(exporter);
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ConditionalOnProperty("jhipster.logging.spectator-metrics.enabled")
@ExportMetricWriter
MetricWriter metricWriter() {
    return new SpectatorLogMetricWriter();
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
public LogstashMetricWriter metricWriter() {
    return new LogstashMetricWriter();
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
/**
 * Exports actuator metrics to JMX.
 */
@Bean
@ExportMetricWriter
public MetricWriter metricWriter(MBeanExporter exporter) {
    return new JmxMetricWriter(exporter);
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
/**
 * Export a new {@link StatfulMetricWriter} metrics writer.
 * @return {@link MetricWriter}
 */
@Bean
@ExportMetricWriter
MetricWriter metricWriter() {
    return new StatfulMetricWriter();
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
public MetricWriter metricWriter(MetricExportProperties export) {
    return new RedisMetricRepository(redisConnectionFactory,
            export.getRedis().getPrefix(), export.getRedis().getKey());
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
public JmxMetricWriter jmxMetricWriter(
		@Qualifier("mbeanExporter") MBeanExporter exporter) {
	return new JmxMetricWriter(exporter);
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
MetricWriter prometheusMetricWriter(CollectorRegistry registry) {
    return new PrometheusMetricWriter(registry);
}
 

import org.springframework.boot.actuate.autoconfigure.ExportMetricWriter; //导入依赖的package包/类
@Bean
@ExportMetricWriter
public MetricRepository metricRepository() {
	return new RedisMetricRepository(redisConnectionFactory);
}