Down by me, only the store director I think and Corporate IT know it, but I know for us it's for store devices (RF guns) only, and is heavily locked down n monitored.
Newer Stores or Stores with Scan Bag Go only have Wiki, there are a few Wiki Networks in the stores.....but only Kroger Guest is for Customers.
You can still access it. Whenever it decides to work. Just don't let management see you. Then again, they have NO reason to look at your personal device. EVER.