What does 'Logging' do in Dockerrun.aws.json - amazon-web-services

Question

I'm struggling to work out what the Logging tag does in the Dockerrun.aws.json file for a Single Container Docker Configuration. All the official docs say about it is Logging – Maps the log directory inside the container.
This sounds like they essentially create a volume from /var/log on the EC2 instance to a directory in the docker filesystem as specified by Logging. I have the following Dockerrun.aws.json file:
{
"AWSEBDockerrunVersion": "1",
...
"Logging": "/var/log/supervisor"
}
However, when I go to the AWS Console and request the logs for my instance, none of my custom log files located in /var/log/supervisor are in the log bundles. Can anyone explain to me what the purpose of this Logging tag is and how I may use it (or not) to retrieve my custom logs.
EDIT
Here are the Volume mappings for my container (didn't think to check that):
"Volumes": {
"/var/cache/nginx": "/var/lib/docker/vfs/dir/ff6ecc190ba3413660a946c557f14a104f26d33ecd13a1a08d079a91d2b5158e",
"/var/log/supervisor": "/var/log/eb-docker/containers/eb-current-app"
},
"VolumesRW": {
"/var/cache/nginx": true,
"/var/log/supervisor": true
}
It turns out that /var/log/supervisor is mapping to /var/log/eb-docker/containers/eb-current-app rather than /var/log as I originally suspected. It'd be nice if this was clearer in the documentation.
But it also turns out that I was running the wrong Docker Image which explains why my log files weren't appearing anywhere! Doh!