data "template_file" "filter" {
  template = "$${filter}"

  vars {
    filter = "${var.filter_tags_use_defaults == "true" ? format("dd_monitoring:enabled,dd_azure_storage:enabled,env:%s", var.environment) : "${var.filter_tags_custom}"}"
  }
}

# Monitoring App Services response time
resource "datadog_monitor" "appservices_response_time" {
  name    = "[${var.environment}] App Services response time too high {{#is_alert}}{{comparator}}{{threshold}}s ({{value}}s){{/is_alert}}{{#is_warning}}{{comparator}}{{warn_threshold}}s ({{value}}s){{/is_warning}}"
  type    = "metric alert"
  message = "${coalesce(var.response_time_message, var.message)}"

  query = <<EOF
    min(last_5m): (
      avg:azure.app_services.average_response_time{${data.template_file.filter.rendered}} by {resource_group,region,name}
    ) > ${var.response_time_threshold_critical}
  EOF

  evaluation_delay = "${var.delay}"
  new_host_delay   = "${var.delay}"

  thresholds {
    warning  = "${var.response_time_threshold_warning}"
    critical = "${var.response_time_threshold_critical}"
  }

  silenced = "${var.response_time_silenced}"

  notify_no_data      = true  # Will notify when no data is received
  renotify_interval   = 0
  require_full_window = false
  timeout_h           = 0
  include_tags        = true

  tags = ["env:${var.environment}", "resource:appservices", "team:azure", "provider:azure"]
}

# Monitoring App Services memory usage
resource "datadog_monitor" "appservices_memory_usage_count" {
  name    = "[${var.environment}] App Services memory usage {{#is_alert}}{{comparator}}{{threshold}} ({{value}}){{/is_alert}}{{#is_warning}}{{comparator}}{{warn_threshold}} ({{value}}){{/is_warning}}"
  type    = "metric alert"
  message = "${coalesce(var.memory_usage_message, var.message)}"

  query = <<EOF
    avg(last_5m): (
      avg:azure.app_services.memory_working_set{${data.template_file.filter.rendered}} by {resource_group,region,name}
    ) > ${var.memory_usage_threshold_critical}
  EOF

  evaluation_delay = "${var.delay}"
  new_host_delay   = "${var.delay}"

  thresholds {
    warning  = "${var.memory_usage_threshold_warning}"
    critical = "${var.memory_usage_threshold_critical}"
  }

  silenced = "${var.memory_usage_silenced}"

  notify_no_data      = true  # Will notify when no data is received
  renotify_interval   = 0
  require_full_window = false
  timeout_h           = 0
  include_tags        = true

  tags = ["env:${var.environment}", "resource:appservices", "team:azure", "provider:azure"]
}

# Monitoring App Services 5xx errors percent
resource "datadog_monitor" "appservices_http_5xx_errors_count" {
  name    = "[${var.environment}] App Services HTTP 5xx errors too high {{#is_alert}}{{comparator}}{{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{comparator}}{{warn_threshold}}% ({{value}}%){{/is_warning}}"
  type    = "metric alert"
  message = "${coalesce(var.http_5xx_requests_message, var.message)}"

  query = <<EOF
    sum(last_5m): (
      avg:azure.app_services.http5xx{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count() /
      avg:azure.app_services.requests{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count()
    ) * 100 > ${var.http_5xx_requests_threshold_critical}
  EOF

  evaluation_delay = "${var.delay}"
  new_host_delay   = "${var.delay}"

  thresholds {
    warning  = "${var.http_5xx_requests_threshold_warning}"
    critical = "${var.http_5xx_requests_threshold_critical}"
  }

  silenced = "${var.http_5xx_requests_silenced}"

  notify_no_data      = false # Will NOT notify when no data is received
  renotify_interval   = 0
  require_full_window = false
  timeout_h           = 1
  include_tags        = true

  tags = ["env:${var.environment}", "resource:appservices", "team:azure", "provider:azure"]
}

# Monitoring App Services 4xx errors percent
resource "datadog_monitor" "appservices_http_4xx_errors_count" {
  name    = "[${var.environment}] App Services HTTP 4xx errors too high {{#is_alert}}{{comparator}}{{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{comparator}}{{warn_threshold}}% ({{value}}%){{/is_warning}}"
  type    = "metric alert"
  message = "${coalesce(var.http_4xx_requests_message, var.message)}"

  query = <<EOF
    sum(last_5m): (
      avg:azure.app_services.http4xx{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count() /
      avg:azure.app_services.requests{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count()
    ) * 100 > ${var.http_4xx_requests_threshold_critical}
  EOF

  evaluation_delay = "${var.delay}"
  new_host_delay   = "${var.delay}"

  thresholds {
    warning  = "${var.http_4xx_requests_threshold_warning}"
    critical = "${var.http_4xx_requests_threshold_critical}"
  }

  silenced = "${var.http_4xx_requests_silenced}"

  notify_no_data      = false # Will NOT notify when no data is received
  renotify_interval   = 0
  require_full_window = false
  timeout_h           = 1
  include_tags        = true

  tags = ["env:${var.environment}", "resource:appservices", "team:azure", "provider:azure"]
}

# Monitoring App Services HTTP 2xx & 3xx status pages percent
resource "datadog_monitor" "appservices_http_success_status_rate" {
  name    = "[${var.environment}] App Services HTTP successful responses too low {{#is_alert}}{{comparator}}{{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{comparator}}{{warn_threshold}}% ({{value}}%){{/is_warning}}"
  type    = "metric alert"
  message = "${coalesce(var.http_successful_requests_message, var.message)}"

  query = <<EOF
    sum(last_5m): (
      (avg:azure.app_services.http2xx{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count() +
       avg:azure.app_services.http3xx{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count()) /
      avg:azure.app_services.requests{${data.template_file.filter.rendered}} by {resource_group,region,name}.as_count()
    ) * 100 < ${var.http_successful_requests_threshold_critical}
  EOF

  evaluation_delay = "${var.delay}"
  new_host_delay   = "${var.delay}"

  thresholds {
    warning  = "${var.http_successful_requests_threshold_warning}"
    critical = "${var.http_successful_requests_threshold_critical}"
  }

  silenced = "${var.http_successful_requests_silenced}"

  notify_no_data      = false # Will notify when no data is received
  renotify_interval   = 0
  require_full_window = false
  timeout_h           = 1
  include_tags        = true

  tags = ["env:${var.environment}", "resource:appservices", "team:azure", "provider:azure"]
}