Spring Boot + KotlinでLogstashを使ってログ出力

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buildscript {
    ext {
        springBootVersion = '1.4.1.RELEASE'
        kotlin_version = '1.0.4'
        logstash_logback_encoder_version = "4.7"
    }
...
}

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dependencies {
    compile "org.springframework.boot:spring-boot-starter"
    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    compile "org.springframework.boot:spring-boot-starter-web"

    compile "net.logstash.logback:logstash-logback-encoder:$logstash_logback_encoder_version"
}

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    name="EVENT" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file></file>logs/event.log
        class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <filenamepattern></filenamepattern>logs/event.%d{yyyy-MM-dd}.log.tar.gz
            <maxhistory></maxhistory>7
        
        class="net.logstash.logback.encoder.LogstashEncoder" />
    

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@RestController
open class EventController {

    val log: Logger = LoggerFactory.getLogger("EVENT");

    data class EventLog(val name: String, val type: String)

    @RequestMapping(value = "/event", method = arrayOf(RequestMethod.GET))
    fun index(): String {
        log.info(getLog("event", "click"))
        return "ok"
    }

    fun getLog(name: String, type: String): String {
        return Moshi.Builder().build()
                .adapter(EventLog::class.java)
                .toJson(EventLog(name, type))
    }
}

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{"@timestamp":"2016-11-07T10:29:29.333+09:00","@version":1,"message":"{\"name\":\"event\",\"type\":\"click\"}","logger_name":"EVENT","thread_name":"http-nio-8080-exec-1","level":"INFO","level_value":20000,"HOSTNAME":"xxxx"}

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    fun getLog(name: String, type: String): String {
        return Moshi.Builder().build()
                .adapter(EventLog::class.java)
                .toJson(EventLog(name, type))
    }