terraform 12 - find map object matching values

test.auto.tfvars

sqs_data = {
  matt_test_one = {
    delay        = 10
    max_msg_size = 1024
    environment  = "dev"
  },
  matt_test_two = {
    delay        = 10
    max_msg_size = 2048
    environment  = "test"
  },
  matt_test_three = {
    delay        = 5
    max_msg_size = 4096
    environment  = "prod"
  }
}

test.tf

variable "sqs_data" {
  type = map(object({
    delay        = number
    max_msg_size = number
    environment  = string
  }))
}
output "test" {
  value = [
    for k, v in var.sqs_data :
    k if v["max_msg_size"] == 2048 && v["environment"] == "test"
  ]
}

$ terraform apply
Apply complete! Resources: 0 added, 0 changed, 0 destroyed.
Outputs:
test = [
  "matt_test_two",
]

Updated example with mostly locals:

variable "name_type" {
  default = "matt"

}

locals {
  sqs_data = {
    matt_test_one = {
      delay        = 10
      max_msg_size = 1024
      environment  = "dev"
    },
    matt_test_two = {
      delay        = 10
      max_msg_size = 2048
      environment  = "test"
    },
    matt_test_three = {
      delay        = 5
      max_msg_size = 4096
      environment  = "prod"
    }
  }

  sqs_data_A = [
    for k, v in local.sqs_data :
    k if contains(split("_", k), var.name_type) && v["max_msg_size"] == 2048 && v["environment"] == "test"
  ]
}

output "test" {
  value = local.sqs_data_A
}