You can get your mdc attributes by using the appender settings and passing it as -D<property>=<value> format.

For example, for logback you can use otel.instrumentation.logback-appender.experimental.capture-mdc-attributes=* and for log4j you can use otel.instrumentation.log4j-appender.experimental.capture-mdc-attributes=*. Checkout this documentation for more system properties.

• If you are collecting application logs from file then make sure that you are emitting the trace_id and span_id to those logs.
• Once you have trace_id and span_id in your logs, you can parse them using pipelines trace parser - documentation here

You can extract these using the logs pipelines trace parser - documentation here

The best way to do this is using Logs Pipeline. You can follow these two Docs:

• Logs Pipeline Introductions
• Parse JSON logs with Pipelines

Check by adding a console exporter on application level if you are using SDK else on a local collector level. Once the above is checked and if you are still facing issue then reach out to us on Intercom - the chatbox at the bottom right corner of your SigNoz Cloud interface.

Reach out to us on Intercom - the chatbox at the bottom right corner of your SigNoz Cloud interface.