Enable device approval and set key expiry in the admin console

In the October 12, 2021 blog post, the authors discuss improvements to the admin console, specifically focusing on device approval and key expiry settings. Device approval requires administrative authorization for any new device added to the network, enhancing security by ensuring only approved devices can connect. Additionally, the admin console now allows the setting of key expiry periods, a feature that mandates periodic reauthentication of network devices to confirm their continued validity, thus maintaining network integrity. While the default key expiry is set at 180 days, administrators have the flexibility to adjust this period between 3 and 180 days to suit their security needs, with a potential reduction of the default expiry time planned for the future.