src/sys/pkg/bin/system-update-checker/sysmgr.config

{
  "startup_services": [
    "fuchsia.update.Manager"
  ],
  "services": {
    "fuchsia.update.channel.Provider": "fuchsia-pkg://fuchsia.com/system-update-checker#meta/system-update-checker.cmx",
    "fuchsia.update.Manager": "fuchsia-pkg://fuchsia.com/system-update-checker#meta/system-update-checker.cmx"
  }
}