Warnings on provider version

[yujunz]

What is the provider null used for? I didn't find related usage in the code.

$ terraform init                                                                                                                    Initializing modules...
- module.acm_request_certificate
  Getting source "git::https://github.com/cloudposse/terraform-aws-acm-request-certificate.git?ref=0.2.2"

Initializing the backend...

Initializing provider plugins...
- Checking for available provider plugins on https://releases.hashicorp.com...
- Downloading plugin for provider "null" (1.0.0)...

The following providers do not have any version constraints in configuration,
so the latest version was installed.

To prevent automatic upgrades to new major versions that may contain breaking
changes, it is recommended to add version = "..." constraints to the
corresponding provider blocks in configuration, with the constraint strings
suggested below.

* provider.null: version = "~> 1.0"

[yujunz]

Found a resource null_xxx. Is it a placeholder?

[osterman]

It's probably from this module: https://github.com/cloudposse/terraform-null-label

We use this module in all of our modules to generate consistent resource names.

[yujunz]

Interesting. I'll have a look. Thanks.