重复GCP警报条件，地形块-如何将它们提取成一个常数？

Question

我在地面上设置了几个警报，还有几个有相同的政策。我能把它提取成某种变量吗?这样我就不必把它硬编码到每个警报中了吗？警报器除了那个普通的情况外，还会有其他的情况。

示例：

resource "google_monitoring_alert_policy" "alert_policy_1" {
  display_name = "My Alert Policy 1"
  combiner     = "OR"
  conditions {
    display_name = "test condition"
    condition_threshold {
      filter     = "metric.type=\"compute.googleapis.com/instance/disk/write_bytes_count\" AND resource.type=\"gce_instance\""
      duration   = "60s"
      comparison = "COMPARISON_GT"
      aggregations {
        alignment_period   = "60s"
        per_series_aligner = "ALIGN_RATE"
      }
    }
  }

conditions {
    display_name = "test condition 2"
    condition_threshold {
      filter     = "metric.type=\"compute.googleapis.com/instance/disk/write_bytes_count\" AND resource.type=\"gce_instance\""
      duration   = "60s"
      comparison = "COMPARISON_GT"
      aggregations {
        alignment_period   = "60s"
        per_series_aligner = "ALIGN_RATE"
      }
    }
  }

  user_labels = {
    foo = "bar"
  }
}

resource "google_monitoring_alert_policy" "alert_policy_2" {
  display_name = "My Alert Policy 2"
  combiner     = "OR"
  conditions {
    display_name = "test condition"
    condition_threshold {
      filter     = "metric.type=\"compute.googleapis.com/instance/disk/write_bytes_count\" AND resource.type=\"gce_instance\""
      duration   = "60s"
      comparison = "COMPARISON_GT"
      aggregations {
        alignment_period   = "60s"
        per_series_aligner = "ALIGN_RATE"
      }
    }
  }

  user_labels = {
    foo = "bar"
  }
}

我能避免在这里重复test condition吗？

Answer 1

您可以使用本地值和嵌套动态块的组合来实现这一点，但老实说，您最终会得到更多的代码，而不仅仅是在您拥有这些值的情况下输入它们。

另一种选择是使用Terraform模板，但是它并不是那么清晰或声明性的。

另一种选择是使用模块进行抽象，并在模块文档中提供与抽象一起提供的公共条件列表。

然后，该模块处理可能需要的所有混乱的嵌套动态块和循环。

在编写模块之后，在本例中调用/配置代码可能如下所示：

module "alert_policy_1" {
  source = ../modules/common-alerts

  display_name = "My Alert Policy 1"
  combiner     = "OR"
  
  # use dynamic blocks within the module to handle nested values in for an array of custom conditions
  custom_conditions = [
    {
      display_name = "test condition"
      condition_threshold {
        filter     = "metric.type=\"some different and unique metric" AND resource.type=\"gce_instance\""
        duration   = "60s"
        comparison = "COMPARISON_GT"
        aggregations {
          alignment_period   = "60s"
          per_series_aligner = "ALIGN_RATE"
        }
      }
    }
  ]

  # the module then has a documented list of common policies to consume
  common_conditions = [
    "google_compute_write_bytes_count"
  ]

  user_labels = {
    foo = "bar"
  }
}

module "alert_policy_2" {
  source = ../modules/common-alerts

  display_name = "My Alert Policy 2"
  combiner     = "OR"
  common_conditions = [
    "google_compute_write_bytes_count"
  ]

  user_labels = {
    foo = "bar"
  }
}

# if OR is common and as are the user labels they could be provided by module variable defaults.

module "alert_policy_3" {
  source = ../modules/common-alerts

  display_name = "My Alert Policy 3"  
  common_conditions = [
    "google_compute_write_bytes_count"
  ]
}