Get a campaign attribute metric

curl --request POST \
  --url https://your_a2_service/metric/campaigns_attribute \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "campaign_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "from_datetime": "2023-11-07T05:31:56Z",
  "to_datetime": "2023-11-07T05:31:56Z"
}'

{
  "cid": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "frequency": {
    "age": {
      "10-20": 1,
      "20-30": 2
    }
  },
  "id": 123,
  "tagid": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}