Terraform Defaults and Local

Now you tfvars file can have only defaults for larger groups of vars.

variable "liveness_default" {
  type = map
  default = {
    health_threshold   = 1
    interval           = 5
    logging            = true
    path               = "/health"
    timeout            = 1
    unhealth_threshold = 2
  }
}

variable "liveness" {
  type    = map
  default = {}
}

locals {
  liveness    = merge(var.liveness_default,     var.liveness)
}

resource google_liveness_thingy "mylivenessthingy" {
    name               = "${var.name}-liveness-probe"
    health_threshold   = local.liveness["health_threshold"]
    interval           = local.liveness["interval"]
    logging            = local.liveness["logging"]
    path               = local.liveness["path"]
    timeout            = local.liveness["timeout"]
    unhealth_threshold = local.liveness["unhealth_threshold"]
}