Hello from the fleet sample app
hostname:        f3d9c53d6daf
held (touched):  0 MB
heap in use:     0 MB
reserved from OS:8 MB

Prove the guarantee:
  curl 'http://127.0.0.1:<port>/alloc?mb=3500'   # grab & touch 3.5GB
  curl  http://127.0.0.1:<port>/free             # release it