Hibernates a server: once hibernated it is billed a much lower HIBERNATION RATE (shown by gpucloud_get_server under hibernation, and returned by this tool as hibernationFee) instead of its hourly rate, for as long as it exists: tell the user this cost before hibernating; to stop paying entirely, delete the server. Root disk data is kept (ephemeral disks are not). The public IP address is RELEASED: a new, different one is assigned on restore, and SSH may then report a changed host key for it. Restore it later with gpucloud_restore_server: restoring takes a few minutes and depends on GPU availability. (permission: servers:hibernate) [Requires a free GPU Cloud account and MCP key]