feat(spanner): add autoscaling config for instance partition and missing asymmetric autoscaling override fields (#16810) (#1258)

[upstream:cd35fd6bcbd9b2ce9091f80a6adec88a4875a7db]

Signed-off-by: Modular Magician <magic-modules@google.com>

Author: modular-magician

spanner_instance_partition_autoscaling/backing_file.tf

@@ -0,0 +1,15 @@
+# This file has some scaffolding to make sure that names are unique and that
+# a region and zone are selected when you try to create your Terraform resources.
+
+locals {
+  name_suffix = "${random_pet.suffix.id}"
+}
+
+resource "random_pet" "suffix" {
+  length = 2
+}
+
+provider "google" {
+  region = "us-central1"
+  zone   = "us-central1-c"
+}

spanner_instance_partition_autoscaling/main.tf

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+resource "google_spanner_instance" "main" {
+  name         = "test-instance-${local.name_suffix}"
+  config       = "nam6"
+  display_name = "main-instance"
+  num_nodes    = 1
+  edition     = "ENTERPRISE_PLUS"
+}
+
+resource "google_spanner_instance_partition" "partition" {
+  name         = "test-partition-${local.name_suffix}"
+  instance     = google_spanner_instance.main.name
+  config       = "nam8"
+  display_name = "test-spanner-partition"
+  autoscaling_config {
+    autoscaling_limits {
+      min_processing_units = 1000
+      max_processing_units = 2000
+    }
+    autoscaling_targets {
+      high_priority_cpu_utilization_percent = 65
+      storage_utilization_percent           = 95
+    }
+  }
+}

spanner_instance_partition_autoscaling/motd

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+===
+
+These examples use real resources that will be billed to the
+Google Cloud Platform project you use - so make sure that you
+run "terraform destroy" before quitting!
+
+===

spanner_instance_partition_autoscaling/tutorial.md

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+# Spanner Instance Partition Autoscaling - Terraform
+
+## Setup
+
+<walkthrough-author name="rileykarson@google.com" analyticsId="UA-125550242-1" tutorialName="spanner_instance_partition_autoscaling" repositoryUrl="https://github.com/terraform-google-modules/docs-examples"></walkthrough-author>
+
+Welcome to Terraform in Google Cloud Shell! We need you to let us know what project you'd like to use with Terraform.
+
+<walkthrough-project-billing-setup></walkthrough-project-billing-setup>
+
+Terraform provisions real GCP resources, so anything you create in this session will be billed against this project.
+
+## Terraforming!
+
+Let's use {{project-id}} with Terraform! Click the Cloud Shell icon below to copy the command
+to your shell, and then run it from the shell by pressing Enter/Return. Terraform will pick up
+the project name from the environment variable.
+
+```bash
+export GOOGLE_CLOUD_PROJECT={{project-id}}
+```
+
+After that, let's get Terraform started. Run the following to pull in the providers.
+
+```bash
+terraform init
+```
+
+With the providers downloaded and a project set, you're ready to use Terraform. Go ahead!
+
+```bash
+terraform apply
+```
+
+Terraform will show you what it plans to do, and prompt you to accept. Type "yes" to accept the plan.
+
+```bash
+yes
+```
+
+
+## Post-Apply
+
+### Editing your config
+
+Now you've provisioned your resources in GCP! If you run a "plan", you should see no changes needed.
+
+```bash
+terraform plan
+```
+
+So let's make a change! Try editing a number, or appending a value to the name in the editor. Then,
+run a 'plan' again.
+
+```bash
+terraform plan
+```
+
+Afterwards you can run an apply, which implicitly does a plan and shows you the intended changes
+at the 'yes' prompt.
+
+```bash
+terraform apply
+```
+
+```bash
+yes
+```
+
+## Cleanup
+
+Run the following to remove the resources Terraform provisioned:
+
+```bash
+terraform destroy
+```
+```bash
+yes
+```