{
  "message": {
    "Server1.example.com": [
      {
        "application": "Apache",
        "host": {
          "name": "/^Server-[13456]/"
        },
        "owner": "User1",
        "project": "Web",
        "subowner": "User2"
      }
    ],
    "Server2.example.com": [
      {
        "application": "Mysql",
        "host": {
          "name": "/^Server[23456]/"
        },
        "owner": "User2",
        "project": "DB",
        "subowner": "User3"
      }
    ]
  },
  "response_ms": 659,
  "success": true
}

type ServerDetails struct  {
  Message  struct{
    Hostname struct{
      Details struct{
        Application string `json:"application"`
        }`json:"-"`
       }`json:"-"`
     }`json:"message"`
}

{
    "application": "Apache",
    "host": {
      "name": "/^Server-[13456]/"
    },

type YourStruct struct {
    Success bool
    ResponseMS int
    Servers map[string]*ServerStruct
}

type ServerStruct struct {
    Application string
    Owner string
    [...]
}

type AutoGenerated struct {
    Message struct {
        Server1ExampleCom []struct {
            Application string `json:"application"`
            Host struct {
                Name string `json:"name"`
            } `json:"host"`
            Owner string `json:"owner"`
            Project string `json:"project"`
            Subowner string `json:"subowner"`
        } `json:"Server1.example.com"`
        Server2ExampleCom []struct {
            Application string `json:"application"`
            Host struct {
                Name string `json:"name"`
            } `json:"host"`
            Owner string `json:"owner"`
            Project string `json:"project"`
            Subowner string `json:"subowner"`
        } `json:"Server2.example.com"`
    } `json:"message"`
    ResponseMs int `json:"response_ms"`
    Success bool `json:"success"`
}