message: [ACR] Update policy schema with default values.
diff: }
  },
  "OperationServiceSpecificationDefinition": {
  - "description": "The definition of Azure Monitoring metrics list.",
  + "description": "The definition of Azure Monitoring list.",
  "type": "object",
  "properties": {
  "metricSpecifications": {
  "properties": {
  "status": {
  "description": "The value that indicates whether the policy is enabled or not.",
  + "default": "disabled",
  "enum": [
  "enabled",
  "disabled"
  "properties": {
  "type": {
  "description": "The type of trust policy.",
  + "default": "Notary",
  "enum": [
  "Notary"
  ],
  },
  "status": {
  "description": "The value that indicates whether the policy is enabled or not.",
  + "default": "disabled",
  "enum": [
  "enabled",
  "disabled"
  "properties": {
  "days": {
  "format": "int32",
  - "description": "The number of days to retain manifest before it expires.",
  + "description": "The number of days to retain an untagged manifest after which it gets purged.",
  + "default": 7,
  "type": "integer"
  },
  "lastUpdatedTime": {
  },
  "status": {
  "description": "The value that indicates whether the policy is enabled or not.",
  + "default": "disabled",
  "enum": [
  "enabled",
  "disabled"
  