Get the stats of the service

curl --request GET \
  --url https://sandbox.{domain}/metrics \
  --header 'E2b-Sandbox-Id: <e2b-sandbox-id>' \
  --header 'E2b-Sandbox-Port: <e2b-sandbox-port>' \
  --header 'X-Access-Token: <api-key>'

{
  "ts": 123,
  "cpu_count": 123,
  "cpu_used_pct": 123,
  "mem_total": 123,
  "mem_used": 123,
  "disk_used": 123,
  "disk_total": 123,
  "mem_used_mib": 123,
  "mem_total_mib": 123
}