Add support for Adaptive Metrics

[Hronom]

Need support for Adaptive Metrics in terraform.

Here is the current workaround that I use:

locals {
  authorization_base64 = base64encode("${var.GRAFANA_ADAPTIVE_METRICS_TENANT}:${var.GRAFANA_ADAPTIVE_METRICS_TOKEN}")
}

# In order to "Upload new aggregation rules" we need to follow two step process described here
# https://grafana.com/docs/grafana-cloud/account-management/billing-and-usage/control-metrics-usage-via-adaptive-metrics/#upload-new-aggregation-rules
# There special header Etag that we need to get from previous upload and put value from it in header If-Match
data "http" "current_adaptive_metrics_aggregation_rules" {
  url = "${var.GRAFANA_ADAPTIVE_METRICS_URL}/aggregations/rules"

  method = "GET"

  # Optional request headers
  request_headers = {
    Accept        = "application/json"
    Authorization = "Basic ${local.authorization_base64}"
  }
}

data "http" "new_adaptive_metrics_aggregation_rules" {
  url = "${var.GRAFANA_ADAPTIVE_METRICS_URL}/aggregations/rules"

  method = "POST"

  # Optional request headers
  request_headers = {
    Accept        = "application/json"
    Authorization = "Basic ${local.authorization_base64}"
    If-Match      = data.http.current_adaptive_metrics_aggregation_rules.response_headers.Etag
  }

  request_body = var.grafana_adaptive_metrics_recommendations
}

# Inspired by https://registry.terraform.io/providers/hashicorp/http/latest/docs/data-sources/http#usage-with-provisioner
resource "null_resource" "new_adaptive_metrics_aggregation_rules_check" {
  # On success, this will attempt to execute the true command in the
  # shell environment running terraform.
  # On failure, this will attempt to execute the false command in the
  # shell environment running terraform.
  provisioner "local-exec" {
    command = contains([200], data.http.new_adaptive_metrics_aggregation_rules.status_code)
  }
}

This solution is the hack that applies during plan phase instead of apply.

[jacobstr]

Thanks for this workaround @Hronom. I suspect we're going to run head first into this as well, we try to manage a subset of Grafana using IAC and this certainly looks to fall under that subset. local-exec provisioners do make me cringe a bit whenever I have to use them - would be lovely to have a well-trodden path built into the provider for this.

[grafuzer]

@Hronom we are working on it!

See the project here Terraform Provider for Adaptive Metrics: https://github.com/grafana/terraform-provider-grafana-adaptive-metrics

[julienduchesne]

A first release of the provider went out today: https://registry.terraform.io/providers/grafana/grafana-adaptive-metrics/latest 🎉. You can direct your questions and file issues in its provider from now on: https://github.com/grafana/terraform-provider-grafana-adaptive-metrics