Pardon my ignorance, what is "modern ssh access management" ... Is there a toggle on an OS to enforce this lease-mode mode ssh, like say on Ubuntu 18.04 LTS. .

Pardon my ignorance, what is "modern ssh access management" ... Is there a toggle on an OS to enforce this lease-mode mode ssh, like say on Ubuntu 18.04 LTS. ... Or are you speaking about some niche ssh key usage paradigm such as a apart of a custom keyring authorization access system for short term client usage to a service. thanks.