[BUG] Export-AzPolicyAssignmentRuleData unable to export Azure policy as PSRule (The function "field" was not found) [Custom policy: DDoS Alert Rules For PublicIP]

[Marc013]

Existing rule

No response

Description of the issue

Unable to export policy assignment data to PSRule.

{
    "Name": "00000000-0000-0000-0000-000000000000",
    "ResourceId": "/providers/Microsoft.Management/managementGroups/MyManagementGroup/providers/Microsoft.Authorization/policyDefinitions/00000000-0000-0000-0000-000000000000",
    "ResourceName": "00000000-0000-0000-0000-000000000000",
    "ResourceType": "Microsoft.Authorization/policyDefinitions",
    "SubscriptionId": null,
    "Properties": {
        "Description": "This policy deploys alert rules for Azure Public IP Addresses if not exist.",
        "DisplayName": "DDoS Alert Rules For PublicIP",
        "Metadata": {
            "version": "0.0.1",
            "category": "Monitoring",
            "status": "Active",
            "Control": "ABC1, ABC2, ABC3, ABC4, ABC5",
            "purpose": "This policy deploys alert rules for Azure Public IP Addresses if not exist.",
            "tags": [
                {
                    "managedpolicy": "true"
                }
            ],
            "createdBy": "00000000-0000-0000-0000-000000000000",
            "createdOn": "2023-06-14T14:15:52.8625112Z",
            "updatedBy": null,
            "updatedOn": null
        },
        "Mode": "Indexed",
        "Parameters": {
            "resourceTags": {
                "type": "object",
                "metadata": {
                    "displayName": "Alert Tags",
                    "description": "Tags to be added in alerts"
                }
            },
            "alertDescription": {
                "type": "String",
                "metadata": {
                    "displayName": "Alert Description",
                    "description": "Description of alert"
                },
                "defaultValue": "DDOS"
            },
            "alertSeverity": {
                "type": "String",
                "metadata": {
                    "displayName": "Alert Severity",
                    "description": "Severity of alert {0,1,2,3,4}"
                },
                "allowedValues": [
                    "0",
                    "1",
                    "2",
                    "3",
                    "4"
                ],
                "defaultValue": "0"
            },
            "metricName": {
                "type": "String",
                "metadata": {
                    "displayName": "Metric Name",
                    "description": "Name of the metric used in the comparison to activate the alert."
                },
                "defaultValue": "IfUnderDDoSAttack"
            },
            "operator": {
                "type": "String",
                "metadata": {
                    "displayName": "Operator",
                    "description": "Operator comparing the current value with the threshold value."
                },
                "allowedValues": [
                    "Equals",
                    "NotEquals",
                    "GreaterThan",
                    "GreaterThanOrEqual",
                    "LessThan",
                    "LessThanOrEqual"
                ],
                "defaultValue": "GreaterThan"
            },
            "timeAggregation": {
                "type": "String",
                "metadata": {
                    "displayName": "timeAggregation",
                    "description": "How the data that is collected should be combined over time."
                },
                "allowedValues": [
                    "Average",
                    "Minimum",
                    "Maximum",
                    "Total",
                    "Count"
                ],
                "defaultValue": "Maximum"
            },
            "evaluationFrequency": {
                "type": "String",
                "metadata": {
                    "displayName": "Evaluation Frequency",
                    "description": "how often the metric alert is evaluated represented in ISO 8601 duration format"
                },
                "allowedValues": [
                    "PT1M",
                    "PT5M",
                    "PT15M",
                    "PT30M",
                    "PT1H"
                ],
                "defaultValue": "PT5M"
            },
            "windowSize": {
                "type": "String",
                "metadata": {
                    "displayName": "Window Size",
                    "description": "Period of time used to monitor alert activity based on the threshold. Must be between one minute and one day. ISO 8601 duration format."
                },
                "allowedValues": [
                    "PT1M",
                    "PT5M",
                    "PT15M",
                    "PT30M",
                    "PT1H",
                    "PT6H",
                    "PT12H",
                    "PT24H"
                ],
                "defaultValue": "PT5M"
            },
            "actionGroupId": {
                "type": "String",
                "metadata": {
                    "displayName": "Action Group Id",
                    "description": "The ID of the action group that is triggered when the alert is activated or deactivated."
                }
            },
            "targetResourceType": {
                "type": "String",
                "metadata": {
                    "displayName": "target Resource Type",
                    "description": "Specifies the target resource type. For example: Microsoft.Network/publicIPAddresses"
                },
                "defaultValue": "Microsoft.Network/publicIPAddresses"
            }
        },
        "PolicyRule": {
            "if": {
                "field": "type",
                "equals": "[parameters('targetResourceType')]"
            },
            "then": {
                "effect": "deployIfNotExists",
                "details": {
                    "type": "Microsoft.Insights/metricalerts",
                    "existenceCondition": {
                        "allOf": [
                            {
                                "field": "name",
                                "equals": "[concat('DDoSAlert','-', field('name'))]"
                            },
                            {
                                "field": "Microsoft.Insights/metricalerts/targetResourceType",
                                "equals": "[parameters('targetResourceType')]"
                            },
                            {
                                "field": "Microsoft.Insights/metricalerts/actions[*].actionGroupId",
                                "equals": "[parameters('actionGroupId')]"
                            },
                            {
                                "field": "Microsoft.Insights/metricalerts/enabled",
                                "equals": "true"
                            },
                            {
                                "field": "Microsoft.Insights/metricalerts/scopes[*]",
                                "equals": "[concat('/subscriptions/', subscription().subscriptionId, '/resourcegroups/', resourceGroup().name, '/providers/', parameters('targetResourceType'), '/', field('name'))]"
                            }
                        ]
                    },
                    "roleDefinitionIds": [],
                    "deployment": {
                        "properties": {
                            "mode": "incremental",
                            "template": {
                                "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
                                "contentVersion": "1.0.0.0",
                                "parameters": {
                                    "Name": {
                                        "type": "string"
                                    },
                                    "targetResourceType": {
                                        "type": "string"
                                    },
                                    "actionGroupId": {
                                        "type": "string"
                                    },
                                    "alertDescription": {
                                        "type": "string"
                                    },
                                    "alertSeverity": {
                                        "type": "string"
                                    },
                                    "evaluationFrequency": {
                                        "type": "string"
                                    },
                                    "windowSize": {
                                        "type": "string"
                                    },
                                    "metricName": {
                                        "type": "string"
                                    },
                                    "operator": {
                                        "type": "string"
                                    },
                                    "timeAggregation": {
                                        "type": "string"
                                    },
                                    "resourceTags": {
                                        "type": "object"
                                    }
                                },
                                "variables": {},
                                "resources": [
                                    {
                                        "name": "[concat('DDoSAlert','-',parameters('name'))]",
                                        "type": "Microsoft.Insights/metricAlerts",
                                        "location": "global",
                                        "apiVersion": "2018-03-01",
                                        "tags": "[parameters('resourceTags')]",
                                        "properties": {
                                            "description": "[parameters('alertDescription')]",
                                            "severity": "[int(parameters('alertSeverity'))]",
                                            "enabled": "true",
                                            "scopes": [
                                                "[concat('/subscriptions/', subscription().subscriptionId, '/resourcegroups/', resourceGroup().name, '/providers/', parameters('targetResourceType'), '/', parameters('name'))]"
                                            ],
                                            "evaluationFrequency": "[parameters('evaluationFrequency')]",
                                            "windowSize": "[parameters('windowSize')]",
                                            "criteria": {
                                                "odata.type": "Microsoft.Azure.Monitor.SingleResourceMultipleMetricCriteria",
                                                "allOf": [
                                                    {
                                                        "name": "1st criteria",
                                                        "metricName": "[parameters('metricName')]",
                                                        "dimensions": [],
                                                        "operator": "[parameters('operator')]",
                                                        "threshold": 0,
                                                        "timeAggregation": "[parameters('timeAggregation')]"
                                                    }
                                                ]
                                            },
                                            "actions": [
                                                {
                                                    "actionGroupId": "[parameters('actionGroupId')]"
                                                }
                                            ]
                                        }
                                    }
                                ]
                            },
                            "parameters": {
                                "name": {
                                    "value": "[field('name')]"
                                },
                                "targetResourceType": {
                                    "value": "[parameters('targetResourceType')]"
                                },
                                "actionGroupId": {
                                    "value": "[parameters('actionGroupId')]"
                                },
                                "alertDescription": {
                                    "value": "[parameters('alertDescription')]"
                                },
                                "alertSeverity": {
                                    "value": "[parameters('alertSeverity')]"
                                },
                                "evaluationFrequency": {
                                    "value": "[parameters('evaluationFrequency')]"
                                },
                                "windowSize": {
                                    "value": "[parameters('windowSize')]"
                                },
                                "metricName": {
                                    "value": "[parameters('metricName')]"
                                },
                                "operator": {
                                    "value": "[parameters('operator')]"
                                },
                                "timeAggregation": {
                                    "value": "[parameters('timeAggregation')]"
                                },
                                "resourceTags": {
                                    "value": "[parameters('resourceTags')]"
                                }
                            }
                        }
                    }
                }
            }
        },
        "PolicyType": 1
    },
    "PolicyDefinitionId": "/providers/Microsoft.Management/managementGroups/MyManagementGroup/providers/Microsoft.Authorization/policyDefinitions/00000000-0000-0000-0000-000000000000"
}

Error messages

An error occurred evaluating expression '[concat('DDoSAlert','-', field('name'))]' line 159. The function "field" was not found.

Reproduction

Exporting policy assignment data

Version of PSRule

2.9.0

Version of PSRule for Azure

1.33.2

Additional context

This bug is related to #1323