Add logs section to Ad Service (#4935)

Co-authored-by: Severin Neumann <[email protected]>
Co-authored-by: Phillip Carter <[email protected]>

Author: 3 people

content/en/docs/demo/services/ad.md

@@ -124,4 +124,7 @@ The following auto-instrumented metrics are available for the application:
 
 ## Logs
 
-TBD
+Ad Service uses Log4J, which is automatically configured by the OTel Java agent.
+
+It includes the trace context in log records, enabling log correlation with
+traces.