src/sys/core/config/core.profiles

// Profiles common to core and derivatives.
{
  "scope": "core",
  "profiles": {
    "fuchsia.scenic.main:hz=60": { "capacity": "16ms", "deadline": "16ms", "period": "16ms" },
    "fuchsia.netstack.go-worker": { "priority": 25 },
  },
}