Add support to count in timeboard graphs

[dustinblackman]

I've been experimenting with PRing the ability to add count to the datadog_timeboard graphs in the same way you do terraform resources to make the below example work. I later found the majority of the count logic seems to live in the main terraform executable rather then in each provider so I found myself stuck.

I feel this would be a useful feature. Is there another way to accomplish this? Or could someone point me in the right direction to put make the addition myself please?

Terraform Version

Terraform v0.11.2

• provider.datadog v1.0.3

Affected Resource(s)

Please list the resources as a list, for example:

• datadog_timeboard

Terraform Configuration Files

What I'd like to accomplish.

variable "my_list" {
  default = ["First", "Second", "Third"]
}

resource "datadog_timeboard" "my_timeboard" {
  title       = "My Timeboard"
  description = "My Description"
  read_only   = true

  graph {
    count = "${length(var.my_list)}"
    title = "${element(var.my_list, count.index)}"
    viz   = "timeseries"

    request {
      q = "anomalies(sum:mycount{adapter:${element(var.my_list, count.index)}}.as_count().rollup(sum, 3600), 'robust', 4, direction='below')"
    }
  }
}

[ghost]

Count can't be applied to inner objects, so you'd need to create some object with a count and reference it in the timeboard resource. Offhand, I can't conceptualize how to make a data template work with this, but it might be doable.

I think creating a new graph data source could work, but that's a bit of a weird model because the resource ends up being just a local storage vehicle and not actually existing in the API.

[bkabrda]

Seems like this could be solved using the dynamic blocks feature that's been newly introduced in TF 0.12 [1]. I'll create a PR for our docs to present example usage.

[1] https://www.terraform.io/docs/configuration/expressions.html#dynamic-blocks