Feature Request: Ability to specify default tags at provider level

[gavinclarkeuk]

Terraform Version

1.2.1 (although this is a provider request)

Affected Resource(s)

All resource types that support tags

Details

It would be great if it were possible to define a set of default tags at the provider level, that automatically get applied to all resources managed by a given provider instance. This feature is inspired by a similar feature in the AWS provider.

This would change the provider declaration to look something like this:

provider "datadog" {
  api_key = var.datadog_api_key
  app_key = var.datadog_app_key
  
  default_tags = ["foo:bar", "team:fooBar"]
}

Similar to the AWS provider, if tags are also defined on a specific resource they would be combined with the default tags, overriding any default tags with the same key.

[kderck]

This would be great. We use Terragrunt which creates the Provider at runtime where we interpolate the tags from the directory structure following a Convention over Configuration approach. We include this file once in every child terragrunt.hcl

locals {  
  tags = { 
    service       : basename(get_terragrunt_dir())  
    env           : basename(dirname(get_terragrunt_dir()))
    region        : basename(dirname(dirname(get_terragrunt_dir())))
    created_by    : "terraform"
    version       : get_env("GITHUB_RUN_ID", "Manual") 
    modified_by   : get_platform() == "windows" ? get_env("USERNAME") : get_env("USER", "unknown")
  }
}

generate "provider" {
  path      = "provider.tf"
  if_exists = "overwrite_terragrunt"
  contents  = <<EOF
provider "aws" {
  region  = "${local.tags.region}"
  default_tags {
    tags = {
      service       : "${local.tags.service}"
      env           : "${local.tags.env}"
      region        : "${local.tags.region}"
      created_by    : "${local.tags.created_by}"
      version       : "${local.tags.version}"
      modified_by   : "${local.tags.modified_by}"
    }
  }
}
EOF
}

[nrowegt]

+1 for this. It would be immensely helpful.

[benriou]

+1 too.

[ahached]

It will be really helpfull to have this feature, it make it easier to enforce some defaults tags on all the datadog ressources like aws.

[haidaraM]

+1 for this as well. However, this PR #2486 seems to consider tags as key-values instead of lists. Shouldn't the default tags be a list to match the tags set at the resources level?

[matthewmrichter]

Also, the nesting of default_tags { tags ={} } feels redundant.