resource "datadog_monitor" "redis_cache_hits" {
  count   = "${var.cache_hits_enabled == "true" ? 1 : 0}"
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] Elasticache redis cache hit ratio {{#is_alert}}{{{comparator}}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
  message = "${coalesce(var.cache_hits_message, var.message)}"

  type = "query alert"

  query = <<EOQ
    ${var.cache_hits_time_aggregator}(${var.cache_hits_timeframe}): default(
      avg:aws.elasticache.cache_hits${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}.as_rate() / (
        avg:aws.elasticache.cache_hits${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}.as_rate() +
        avg:aws.elasticache.cache_misses${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}.as_rate())
    * 100, 100) < ${var.cache_hits_threshold_critical}
  EOQ

  thresholds {
    warning  = "${var.cache_hits_threshold_warning}"
    critical = "${var.cache_hits_threshold_critical}"
  }

  notify_no_data      = false
  evaluation_delay    = "${var.evaluation_delay}"
  renotify_interval   = 0
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = false
  new_host_delay      = "${var.new_host_delay}"

  tags = ["env:${var.environment}", "type:cloud", "provider:aws", "resource:elasticache-redis", "team:claranet", "created-by:terraform", "engine:redis", "${var.cache_hits_extra_tags}"]
}

resource "datadog_monitor" "redis_cpu_high" {
  count   = "${var.cpu_high_enabled == "true" ? 1 : 0}"
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] Elasticache redis CPU {{#is_alert}}{{{comparator}}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
  message = "${coalesce(var.cpu_high_message, var.message)}"

  type = "query alert"

  query = <<EOQ
    ${var.cpu_high_time_aggregator}(${var.cpu_high_timeframe}): (
      avg:aws.elasticache.engine_cpuutilization${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}
    ) > ${var.cpu_high_threshold_critical}
  EOQ

  notify_no_data      = true
  evaluation_delay    = "${var.evaluation_delay}"
  renotify_interval   = 0
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = false
  new_host_delay      = "${var.new_host_delay}"

  tags = ["env:${var.environment}", "type:cloud", "provider:aws", "resource:elasticache-redis", "team:claranet", "created-by:terraform", "engine:redis", "${var.cpu_high_extra_tags}"]
}

resource "datadog_monitor" "redis_replication_lag" {
  count   = "${var.replication_lag_enabled == "true" ? 1 : 0}"
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] Elasticache redis replication lag {{#is_alert}}{{{comparator}}} {{threshold}}s ({{value}}s){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}s ({{value}}s){{/is_warning}}"
  message = "${coalesce(var.replication_lag_message, var.message)}"

  type = "query alert"

  query = <<EOQ
    ${var.replication_lag_time_aggregator}(${var.replication_lag_timeframe}): (
      avg:aws.elasticache.replication_lag${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}
    ) > ${var.replication_lag_threshold_critical}
  EOQ

  thresholds {
    warning  = "${var.replication_lag_threshold_warning}"
    critical = "${var.replication_lag_threshold_critical}"
  }

  notify_no_data      = false
  evaluation_delay    = "${var.evaluation_delay}"
  renotify_interval   = 0
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = false
  new_host_delay      = "${var.new_host_delay}"

  tags = ["env:${var.environment}", "type:cloud", "provider:aws", "resource:elasticache-redis", "team:claranet", "created-by:terraform", "engine:redis", "${var.replication_lag_extra_tags}"]
}

resource "datadog_monitor" "redis_commands" {
  count   = "${var.commands_enabled == "true" ? 1 : 0}"
  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] Elasticache redis is receiving no commands"
  message = "${coalesce(var.commands_message, var.message)}"

  type = "query alert"

  query = <<EOQ
    sum(${var.commands_timeframe}): (
      avg:aws.elasticache.get_type_cmds${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}.as_count() +
      avg:aws.elasticache.set_type_cmds${module.filter-tags.query_alert} by {region,cacheclusterid,cachenodeid}.as_count()
    ) <= 0
  EOQ

  notify_no_data      = false
  evaluation_delay    = "${var.evaluation_delay}"
  renotify_interval   = 0
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = false
  new_host_delay      = "${var.new_host_delay}"

  tags = ["env:${var.environment}", "type:cloud", "provider:aws", "resource:elasticache-redis", "team:claranet", "created-by:terraform", "engine:redis", "${var.commands_extra_tags}"]
}