When Home Assistant restarts I no longer see the Hass.io Supervisor menu.
I also get the following in the log:
2020-04-16 15:07:34 ERROR (MainThread) [homeassistant.components.hassio] Missing HASSIO environment variable.
2020-04-16 15:07:34 ERROR (MainThread) [homeassistant.setup] Setup failed for hassio: Integration failed to initialize.