also, does signoz support including request and response body in the trace?

that depends on how the application is instrumented.

Does it support Auto-Instrumentation or Zero-code Instrumentation of Java applications(Spring Boot) running in k8s environment?

Yeah you can check this out https://signoz.io/docs/instrumentation/opentelemetry-java/

about request and response body

don’t think it’s supported by otel, you might have to manually instrument it. https://github.com/open-telemetry/semantic-conventions/issues/857 https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues/1317