Datacenter

data "akamai_gtm_datacenter" "my_datacenter" {
      domain = "example.domain.net"
      datacenter_id = 1234
}

output "my_datacenter" {
  value = data.akamai_gtm_datacenter.my_datacenter
}

Changes to Outputs:
my_datacenter = {
    datacenter = [
        {
            city                              = "Bath"
            clone_of                          = 0
            cloud_server_host_header_override = false
            cloud_server_targeting            = false
            continent                         = "EU"
            country                           = "GB"
            datacenter_id                     = 1234
            default_load_object               = []
            latitude                          = 51.380001
            links                             = [
                {
                    href = "https://akab-h05tnam3wl42son7nktnlnnx-kbob3i3v.luna.akamaiapis.net/config-gtm/v1/domains/example.akadns.net/datacenters/1234"
                    rel  = "self"
                  },
              ]
            longitude                         = -2.360000
            nickname                          = "example_1"
            score_penalty                     = 0
            servermonitor_pool                = ""
            state_or_province                 = ""
            virtual                           = true
          },
      ]
    domain      = "example.alb.akadns.net"
    id          = "example.alb.akadns.net"
  }

variable "datacenter_id" {
    type: string
    description: "My US data center ID"
    default = "4321"
}
variable "nickname" {
    type: string
    description: "My US data center nickname"
    default = "example_2"
}

// local
datacenter_id = data.akamai_gtm_datacenter.my_datacenter.datacenter.datacenter_id
nickname= data.akamai_gtm_datacenter.my_datacenter.datacenter.nickname

// tvars
datacenter_id = var.datacenter_id
nickname = var.nickname