Global variables through output value bubbling

I should fill out some type of issue on the Terraform repository. Values shouldn't need to be bubbled up to the root module like this so they can be accessed elsewhere, right?

databases/imports.tf

@@ -4,3 +4,7 @@ module "pg" {
 
   pg_keycloak_pass = "${var.db_pg_keycloak_pass}"
 }
+
+output "pg_addr" {
+  value = "${module.pg.addr}"
+}

databases/pg/cluster.tf

@@ -20,6 +20,10 @@ provider "postgresql" {
   expected_version = "11.0.0"
 }
 
+output "addr" {
+  value = "${digitalocean_database_cluster.pg_master.host}"
+}
+
 variable "pg_keycloak_pass" {}
 module "keycloak" {
   source = "./keycloak"

globals.tf

@@ -0,0 +1,3 @@
+locals {
+  PG_MASTER_ADDR = "${module.database_resources.pg_addr}"
+}