Lightsail waste check
Lightsail Unattached Disk
lightsail_unattached_disk
What it finds
Lightsail Unattached Disk: one of the Lightsail checks in the compute optimization group. Checks in this group look for: compute capacity that is idle, stopped but still holding paid attachments, oversized for its load, or on an older generation.
Why it costs money
Compute is billed for the time it is provisioned, not for the work it does, so capacity nobody uses keeps billing.
How it is detected
Block storage disk not attached to any instance
Detection confidence: MEDIUM. This is the criterion from our public docs. It runs in a local scan with your own read-only credentials.
AWS's own tools
None of Trusted Advisor, Cost Optimization Hub or Compute Optimizer flags this.
Checked against the AWS documentation.
Run it yourself
Nothing leaves your machine. The local scan has no telemetry.