AppSync waste check
AppSync Idle Subscriptions
appsync_idle_subscriptions
What it finds
AppSync Idle Subscriptions: one of the AppSync checks in the serverless optimization group. Checks in this group look for: serverless functions, state machines and APIs that are unused, mis-sized, on an old runtime, or configured in a way that bills more than needed.
Why it costs money
Serverless bills per request and per unit of memory and time, so a wrong setting multiplies on every invocation.
How it is detected
Runs in the partner build and the paid hosted tiers.
AWS's own tools
None of Trusted Advisor, Cost Optimization Hub or Compute Optimizer flags this.
Checked against the AWS documentation.
Where this check runs
This check ships in the partner build, for consultancies that scan client accounts, and in the paid hosted tiers.