Service backend/frontend in one or two containers?

Imagine in your stack you have RESTful services which also provide some rudimentary frontends, mostly for admin/other tech user use.

Do you include the UI inside the container or are these two containers? Why?

Are they separate projects (from a logical or technical perspective)? Would one ever need to be updated/recreated independently of the other one? Would they need to scale independently of each other? I think if any of those answers is a yes, then they should be separated. If not, you should be fine bundling them together. Bundling them together will reduce discrepancy or compatibility issues between the two containers.

StackExchange DevOps Q#2157, answer score: 9