[Loki Stack] Alloy 에서 Spring boot 로그 라벨링

loki.process "springlog" {

    stage.multiline {

        firstline     = "^\\d{4}-\\d{2}-\\d{2}T"  // ISO timestamp 시작 패턴

        max_wait_time = "3s"

      }

    stage.regex {

        expression = "^(?P<timestamp>\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}\\.\\d+\\+\\d{2}:\\d{2})\\s+(?P<level>TRACE|DEBUG|INFO|WARN|ERROR|FATAL)\\s+(?P<pid>\\d+)\\s+---\\s+\\[(?P<app>[^\\]]+)\\]\\s+\\[(?P<thread>[^\\]]+)\\]\\s+(?P<logger>[^:]+):\\s*(?P<message>.*)$"

        labels_from_groups = true  // 추출된 필드를 자동 라벨로 추가

      }    

 

    forward_to = [loki.write.local_loki.receiver]

}