package main

import (
    "fmt"
    "encoding/json"
    "net/http"
    "io/ioutil"
)

type data struct {

        Target     string          `json:"target"`
        Datapoints [][]interface{} `json:"datapoints"`
}

func main(){
    stuff := data{}

    info, err := http.Get("URLWITHJSONRESPONSE")

    if err != nil {
        panic(err.Error())
    }

    res, err := ioutil.ReadAll(info.Body)

    if err != nil {
        panic(err.Error())
    }

    json.Unmarshal(res, &stuff)

    fmt.Println(res)
    fmt.Println(stuff.Target)
}