N5 Settings > Data Usage Screen

I'm afraid I can't get the link to open, but do I remember correctly that you have lost the option to set a data usage warning and limit? If so, I remember another member had the same problem but don't recall whether a fix was found. Perhaps a replacement SIM card?

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Yes that's the issue. The option disappeared when I replaced my ATT sim card with Sprint. It also doesn't show the WiFi tab any longer. I tried doing a search but nothing came up. I'll try again on the whole forum, not just N5.
 
On the data usage screen, tap on the 3 dot menu (top right) - do you see "Show Wi-Fi" there? If so, tap on it
 
I just checked. It only says Mobile Hotspots and Auto Sync Data. It doesn't even allow me to restrict background data.