DataWriter

can’t find logRequest anymore in v2.0.0 DataWriter. What should be used now?

DataWriter is merely a router, it shouldn’t have been responsible for building messages to be dispatched to registered DataWriters, so we removed logRequest.
You now simply tell a io.gatling.core.result.message.RequestMessage.
See HTTP example here: https://github.com/excilys/gatling/blob/master/gatling-http/src/main/scala/io/gatling/http/ahc/GatlingAsyncHandlerActor.scala#L150