Why does -f json produce non-json output like "This OS version is no longer supported by the distribution" and is there a way to stop it?

[jason-oc]

I'm having to manually prune this output out of the generated json and wondering if there's a better way.

[jason-oc]

When using -o output file all the contents of the output file is json and the other stuff is left to sdtout so it's a workaround that you can use. I don't agree that non-json should be printed once -f json has been specified, personally. Couldn't those messages just be included in the json output? To give more info on my use case, I'm scanning multiple images and I'd like all the output in 1 file that I can then parse with Python.