#
# 4XX Errors
#
resource "datadog_monitor" "error_rate_4xx" {
  count   = var.error_rate_4xx_enabled == "true" ? 1 : 0
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] GCP LB 4xx errors {{#is_alert}}{{{comparator}}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
  message = coalesce(var.error_rate_4xx_message, var.message)
  type    = "query alert"

  query = <<EOQ
  ${var.error_rate_4xx_time_aggregator}(${var.error_rate_4xx_timeframe}):
    default(sum:gcp.loadbalancing.https.request_count{${var.filter_tags},response_code_class:400} by {forwarding_rule_name}.as_rate(), 0) / (
    default(sum:gcp.loadbalancing.https.request_count{${var.filter_tags}} by {forwarding_rule_name}.as_rate() + ${var.error_rate_4xx_artificial_request}, 1))
  * 100 > ${var.error_rate_4xx_threshold_critical}
EOQ

  thresholds = {
    warning  = var.error_rate_4xx_threshold_warning
    critical = var.error_rate_4xx_threshold_critical
  }

  evaluation_delay    = var.evaluation_delay
  new_host_delay      = var.new_host_delay
  notify_audit        = false
  locked              = false
  timeout_h           = 0
  include_tags        = true
  require_full_window = false
  notify_no_data      = false
  renotify_interval   = 0

  tags = concat(["env:${var.environment}", "type:cloud", "provider:gcp", "resource:lb", "team:claranet", "created-by:terraform"], var.error_rate_4xx_extra_tags)
}

#
# 5XX Errors
#
resource "datadog_monitor" "error_rate_5xx" {
  count   = var.error_rate_5xx_enabled == "true" ? 1 : 0
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] GCP LB 5xx errors {{#is_alert}}{{{comparator}}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
  message = coalesce(var.error_rate_5xx_message, var.message)
  type    = "query alert"

  query = <<EOQ
  ${var.error_rate_5xx_time_aggregator}(${var.error_rate_5xx_timeframe}):
    default(sum:gcp.loadbalancing.https.request_count{${var.filter_tags},response_code_class:500} by {forwarding_rule_name}.as_rate(), 0) / (
    default(sum:gcp.loadbalancing.https.request_count{${var.filter_tags}} by {forwarding_rule_name}.as_rate() + ${var.error_rate_5xx_artificial_request}, 1))
  * 100 > ${var.error_rate_5xx_threshold_critical}
EOQ

  thresholds = {
    warning  = var.error_rate_5xx_threshold_warning
    critical = var.error_rate_5xx_threshold_critical
  }

  evaluation_delay    = var.evaluation_delay
  new_host_delay      = var.new_host_delay
  notify_audit        = false
  locked              = false
  timeout_h           = 0
  include_tags        = true
  require_full_window = false
  notify_no_data      = false
  renotify_interval   = 0

  tags = concat(["env:${var.environment}", "type:cloud", "provider:gcp", "resource:lb", "team:claranet", "created-by:terraform"], var.error_rate_5xx_extra_tags)
}

#
# Backend Latency for service
#
resource "datadog_monitor" "backend_latency_service" {
  count   = var.backend_latency_service_enabled == "true" ? 1 : 0
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] GCP LB service backend latency {{#is_alert}}{{{comparator}}} {{threshold}}ms ({{value}}ms){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}ms ({{value}}ms){{/is_warning}}"
  message = coalesce(var.backend_latency_service_message, var.message)
  type    = "query alert"

query = <<EOQ
  ${var.backend_latency_service_time_aggregator}(${var.backend_latency_service_timeframe}):
    default(min:gcp.loadbalancing.https.backend_latencies.avg{${var.filter_tags},backend_target_type:backend_service} by {backend_target_name,forwarding_rule_name}, 0)
  > ${var.backend_latency_service_threshold_critical}
EOQ

  thresholds = {
    warning  = var.backend_latency_service_threshold_warning
    critical = var.backend_latency_service_threshold_critical
  }

  evaluation_delay    = var.evaluation_delay
  new_host_delay      = var.new_host_delay
  notify_audit        = false
  locked              = false
  timeout_h           = 0
  include_tags        = true
  require_full_window = false
  notify_no_data      = false
  renotify_interval   = 0

  tags = concat(["env:${var.environment}", "type:cloud", "provider:gcp", "resource:lb", "team:claranet", "created-by:terraform"], var.backend_latency_service_extra_tags)
}

#
# Backend Latency for bucket
#
resource "datadog_monitor" "backend_latency_bucket" {
  count   = var.backend_latency_bucket_enabled == "true" ? 1 : 0
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] GCP LB bucket backend latency {{#is_alert}}{{{comparator}}} {{threshold}}ms ({{value}}ms){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}ms ({{value}}ms){{/is_warning}}"
  message = coalesce(var.backend_latency_bucket_message, var.message)
  type    = "query alert"

query = <<EOQ
  ${var.backend_latency_bucket_time_aggregator}(${var.backend_latency_bucket_timeframe}):
    default(min:gcp.loadbalancing.https.backend_latencies.avg{${var.filter_tags},backend_target_type:backend_bucket} by {backend_target_name,forwarding_rule_name}, 0)
  > ${var.backend_latency_bucket_threshold_critical}
EOQ

  thresholds = {
    warning  = var.backend_latency_bucket_threshold_warning
    critical = var.backend_latency_bucket_threshold_critical
  }

  evaluation_delay    = var.evaluation_delay
  new_host_delay      = var.new_host_delay
  notify_audit        = false
  locked              = false
  timeout_h           = 0
  include_tags        = true
  require_full_window = false
  notify_no_data      = false
  renotify_interval   = 0

  tags = concat(["env:${var.environment}", "type:cloud", "provider:gcp", "resource:lb", "team:claranet", "created-by:terraform"], var.backend_latency_bucket_extra_tags)
}

#
# Request Count
#
resource "datadog_monitor" "request_count" {
  count   = var.request_count_enabled == "true" ? 1 : 0
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] GCP LB Requests count increased abruptly {{#is_alert}}{{value}}%%{{/is_alert}}{{#is_warning}}{{value}}%%{{/is_warning}}"
  message = coalesce(var.request_count_message, var.message)
  type    = "query alert"

  query = <<EOQ
  pct_change(${var.request_count_time_aggregator}(${var.request_count_timeframe}),${var.request_count_timeshift}):
    default(sum:gcp.loadbalancing.https.request_count{${var.filter_tags}} by {forwarding_rule_name}.as_count(), 0)
  > ${var.request_count_threshold_critical}
EOQ

  thresholds = {
    warning  = var.request_count_threshold_warning
    critical = var.request_count_threshold_critical
  }

  evaluation_delay    = var.evaluation_delay
  new_host_delay      = var.new_host_delay
  notify_audit        = false
  locked              = false
  timeout_h           = 0
  include_tags        = true
  require_full_window = false
  notify_no_data      = false
  renotify_interval   = 0

  tags = concat(["env:${var.environment}", "type:cloud", "provider:gcp", "resource:lb", "team:claranet", "created-by:terraform"], var.request_count_extra_tags)
}