I am running through an issue that I need help with. I have this variable structure:

variable "dns" {
  type = map(object({
  name     = string
  hostname = string
  dns_ips  = list(string)
  }))
  default = {
    "server1" = {
      pretty_name  = "Server One"
      hostname = "vm-01"
      dns_ips      = ["128.0.0.8", "128.0.0.9", "128.0.0.10"]
    }
    "server2" = {
      pretty_name  = "Server Two"
      isp_hostname = "vm-01"
      dns_ips      = ["129.0.0.8", "129.0.0.9", "129.0.0.10", "129.0.0.11"]
    }
  }
}

I want to create a resource “datadog_synthetic_test” which create a DNS test for each of the server.
I want to create multiple resources [with for each]. My end goal is 7 resources:

• vm1, ip1
• vm1, ip2
• vm1, ip3
• vm2, ip1
• vm2, ip2
• vm2, ip3
• vm2, ip4

I know that I need to use flatten but I can’t figure it out…
Resource example:

resource "datadog_synthetics_test" "dns_test" {
  for_each = {
    for server_name, server_info in var.dns : server_name => server_info.dns_ips
  }
  name = "${var.synthetic_prefix} ${each.key} - Resolve @${dns_ip.value}"
  request_definition {
    dns_server              = dns_ip.value
    dns_server_port         = 0
    host                    = var.dns_domain_name[0]
    no_saving_response_body = false
    number_of_packets       = 0
    port                    = 0
    should_track_hops       = false
    timeout                 = 0
  }
}

I tried using for_each as above, I tried to implement flatten but the end result was that an error occurred for

each.value is list of string with 3 elements