Rate limit the requests for labels that have a specified label namespace

If you use the Bot Control managed rule group, you can add rate limiting for requests from individual verified bots. To do this, you add a rate-based rule that runs after the Bot Control rule group and aggregates requests by their bot name labels. You specify the Label namespace aggregation key and set the namespace key to awswaf:managed:aws:bot-control:bot:name:. Each unique label with the specified namespace will define an aggregation instance. For example, the labels awswaf:managed:aws:bot-control:bot:name:axios and awswaf:managed:aws:bot-control:bot:name:curl each define an aggregation instance.

The following web ACL JSON listing shows this configuration. The rule in this example limits requests for any single bot aggregation instance to 1,000 in a two minute period.

{
  "Name": "test-web-acl",
  "Id": ... 
  "ARN": ...
  "DefaultAction": {
    "Allow": {}
  },
  "Description": "",
  "Rules": [
    {
      "Name": "AWS-AWSManagedRulesBotControlRuleSet",
      "Priority": 0,
      "Statement": {
        "ManagedRuleGroupStatement": {
          "VendorName": "AWS",
          "Name": "AWSManagedRulesBotControlRuleSet",
          "ManagedRuleGroupConfigs": [
            {
              "AWSManagedRulesBotControlRuleSet": {
                "InspectionLevel": "COMMON"
              }
            }
          ]
        }
      },
      "OverrideAction": {
        "None": {}
      },
      "VisibilityConfig": {
        "SampledRequestsEnabled": true,
        "CloudWatchMetricsEnabled": true,
        "MetricName": "AWS-AWSManagedRulesBotControlRuleSet"
      }
    },
    {
      "Name": "test-rbr",
      "Priority": 1,
      "Statement": {
        "RateBasedStatement": {
          "Limit": 1000,
          "EvaluationWindowSec": 120,
          "AggregateKeyType": "CUSTOM_KEYS",
          "CustomKeys": [
            {
              "LabelNamespace": {
                "Namespace": "awswaf:managed:aws:bot-control:bot:name:"
              }
            }
          ]
        }
      },
      "Action": {
        "Block": {}
      },
      "VisibilityConfig": {
        "SampledRequestsEnabled": true,
        "CloudWatchMetricsEnabled": true,
        "MetricName": "test-rbr"
      }
    }
  ],
  "VisibilityConfig": {
    "SampledRequestsEnabled": true,
    "CloudWatchMetricsEnabled": true,
    "MetricName": "test-web-acl"
  },
  "Capacity": 82,
  "ManagedByFirewallManager": false,
  "RetrofittedByFirewallManager": false,
  "LabelNamespace": "awswaf:0000000000:webacl:test-web-acl:"
}