The old host page has a drop-down for power actions (it's broken in the new host page, see SAT-38332) which includes an action called "Soft".

When executed against a BMC enabled host with IPMI, the IPMI command is "soft", which is supposed to mean "Graceful Shutdown" (via Power button, or similar). On Redfish the action is "GracefulShutdown", but the button remains labeled "Soft" as the labels come from the time we only supported IPMI.

While the API can probably remain "soft" to keep compatibility, the UI should pick a better label for the button.