Event ID 21 — Restart Required: To complete the installation of the following updates, the computer must be restarted.

{
  "system": {
    "provider": "Microsoft-Windows-WindowsUpdateClient",
    "guid": "945A8954-C147-4ACD-923F-40C45405A658",
    "event_source_name": "",
    "event_id": 21,
    "version": 0,
    "level": 4,
    "task": 2,
    "opcode": 15,
    "keywords": 9223372036854775872,
    "time_created": "2013-10-23T17:27:37.645375Z",
    "event_record_id": 832,
    "correlation": {},
    "execution": {
      "process_id": 916,
      "thread_id": 700
    },
    "channel": "System",
    "computer": "IE8Win7",
    "security": {
      "user_id": "S-1-5-18"
    }
  },
  "user_data": {
    "updatelist": {
      "#attributes": {
        "xmlns:auto-ns3": "http://schemas.microsoft.com/win/2004/08/events",
        "xmlns": "http://manifests.microsoft.com/win/2004/08/windows/eventlog"
      },
      "#text": "\n- Update for Windows 7 (KB2502285)\n- Security Update for Windows 7 (KB2790113)\n- Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 x86 (KB2604114)\n- Update for Windows 7 (KB2779562)\n- Update for Windows 7 (KB2387530)\n- Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 x86 (KB2756920)\n- Update for Windows 7 (KB2541014)\n- Update for Windows 7 (KB2533552)\n- Security Update for Windows 7 (KB2691442)\n- Security Update for Windows 7 (KB979688)\n- Update for Windows 7 (KB979538)\n- Security Update for Windows 7 (KB2511455)\n- Security Update for Windows 7 (KB2506212)\n- Security Update for Windows 7 (KB979309)\n- Update for Windows 7 (KB2748349)\n- Security Update for Windows 7 (KB2658846)\n- Update for Rights Management Services Client for Windows 7 (KB979099)\n- Update for Windows 7 (KB2640148)\n- Security Update for Windows 7 (KB2442962)\n- Security Update for Windows 7 (KB2281679)\n- Security Update for Windows 7 (KB2712808)\n- Update for Windows 7 (KB2467023)\n- Update f"
    }
  }
}