OS Login ties SSH access to the same IAM this course already built.

Revoking a role removes SSH access everywhere — no separate key file to remember.

Hyperdisk vs Persistent Disk

Hyperdisk Balanced provisions IOPS independently of disk size (up to 15,000 IOPS) — Persistent Disk's scales with size alone. Start standard; move up only for a measured bottleneck.

VM Manager

Patch management, OS config, and inventory turn "did we patch every VM" from a manual scramble into a queryable answer.

A patch job's default reboot behavior can trigger cascading instance recreation if a MIG's health check misinterprets a mid-patch reboot as unhealthy. Always test against staging first.