Additonaly, if you are looking for the logs generated from the applications then you won't see them within SDK4.x itself unlike sdk3.x.
With sdk4.x, all your customizations are part of containers launched on docker via docker-compose. If you want to tail logs then you can do following:
1- Either connet to a container e.g. 'alfresco' and tail the log:
docker exec -t -i <containerName/Id> /bin/bash
docker exec -t -i default_alfresco_1 /bin/bash
Here, 'default_alfresco_1' is the name of container. You can find list of launched containers by executing "docker ps" command.
2- Use following command to tail all the logs:
docker-compose -f ./docker-compose.yml logs -f
Alternatively, you can update the docker-compose.yml services to bind mount for log files and data.