logback-spring.xml中的LogstashTcpSocketAppender不会将日志发送到ELK，但可以在基于Java的方法中使用

Question

受这种Java class方法的启发，我正在尝试一种基于XML的方法，用于直接通过IsObserver将日志发送到ELK。这将失败，并且日志不会到达ELK。可能是什么原因？任何帮助将不胜感激。

@配置方法

import Foundation

protocol IsObserver: class {
    associatedtype DataType
    func dataDidUpdate(_ data: [DataType])
}

struct Observation<T: IsObserver> {
    weak var observer: T?
}


protocol HasObservers {
    associatedtype DataType : IsObserver where DataType.DataType == DataType
    static var observations: [ObjectIdentifier : Observation<IsObserver>] { get set } // ERROR: "Value of protocol type 'IsObserver' cannot conform to 'IsObserver'; only struct/enum/class types can conform to protocols"
    static func tellObserversDataDidUpdate(_ data: [DataType])
}

extension HasObservers {
    static func tellObserversDataDidUpdate(_ data: [DataType]) {
        for (id, observation) in observations {
            guard let observer = observation.observer else {
                observations.removeValue(forKey: id)
                continue
            }
            observer.dataDidUpdate(data)
        }
    }

    static func addObserver<T: IsObserver>(_ observer: T) {
        let id = ObjectIdentifier(observer)
        let ob = Observation.init(observer: observer)
        observations[id] = ob
    }

    static func removeObserver<T: IsObserver>(_ observer: T) {
        let id = ObjectIdentifier(observer)
        observations.removeValue(forKey: id)
    }
}

logback-spring.xml方法（不将日志发送到ELK）

logback-spring.xml

删除 private void addLogstashAppender(LoggerContext context) { LogstashTcpSocketAppender logstashAppender = new LogstashTcpSocketAppender(); logstashAppender.setName(LOGSTASH_APPENDER_NAME); logstashAppender.setContext(context); String customFields = "{\"app_name\":\"" + appName + "\",\"app_port\":\"" + serverPort + "\"}"; LogstashEncoder logstashEncoder=new LogstashEncoder(); // Set the Logstash appender config from JHipster properties logstashEncoder.setCustomFields(customFields); // Set the Logstash appender config from JHipster properties logstashAppender.addDestinations(new InetSocketAddress(jHipsterProperties.getLogging().getLogstash().getHost(),jHipsterProperties.getLogging().getLogstash().getPort())); ShortenedThrowableConverter throwableConverter = new ShortenedThrowableConverter(); throwableConverter.setRootCauseFirst(true); logstashEncoder.setThrowableConverter(throwableConverter); logstashEncoder.setCustomFields(customFields); logstashAppender.setEncoder(logstashEncoder); logstashAppender.start(); // Wrap the appender in an Async appender for performance AsyncAppender asyncLogstashAppender = new AsyncAppender(); asyncLogstashAppender.setContext(context); asyncLogstashAppender.setName(ASYNC_LOGSTASH_APPENDER_NAME); asyncLogstashAppender.setQueueSize(jHipsterProperties.getLogging().getLogstash().getQueueSize()); asyncLogstashAppender.addAppender(logstashAppender); asyncLogstashAppender.start(); context.getLogger("ROOT").addAppender(asyncLogstashAppender); } 后，我以调试模式运行了该应用程序，日志如下。什么都没发现。

<appender name="LOGSTASH"
          class="net.logstash.logback.appender.LogstashTcpSocketAppender">
    <destination>${LOGSTASH_HOST}:${LOGSTASH_PORT}</destination>
    <encoder charset="UTF-8"
             class="net.logstash.logback.encoder.LogstashEncoder">
    </encoder>
</appender>   
<root level="info">
    <appender-ref ref="FILE-ROLLING"/>
    <appender-ref ref="LOGSTASH"/>
</root>
<shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>