参见:https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/docs/logger-mdc-instrumentation.md
Logger MDC auto-instrumentation

For Spring Boot configuration which uses logback, you can add MDC to log lines by overriding only the logging.pattern.level:
logging.pattern.level = trace_id=%mdc{trace_id} span_id=%mdc{span_id} trace_flags=%mdc{trace_flags} %5p
参考:https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/instrumentation/logback/logback-mdc-1.0/library
MDC Instrumentation for Logback version 1.0 and higher

本文介绍了如何在使用OpenTelemetryJavaInstrumentation与SpringBoot结合时,通过Logback版本1.0及更高版本,利用MDC(MappedDiagnosticContext)自动为日志添加trace_id、span_id和trace_flags等追踪信息。只需修改logging.pattern.level配置即可实现。
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