const aggregates = await client.assets.aggregate({ filter: { root: true } });
console.log('Number of root assets: ', aggregates[0].count)

aggregate_by_prefix = client.assets.aggregate(filter={"external_id_prefix": "prefix"})
from cognite.client.data_classes.assets import AssetProperty
key_count = client.assets.aggregate_cardinality_properties(AssetProperty.metadata)
from cognite.client.data_classes.assets import AssetProperty
label_count = client.assets.aggregate_cardinality_values(AssetProperty.labels)

from cognite.client.data_classes.filters import Search
from cognite.client.data_classes.assets import AssetProperty
is_critical = Search(AssetProperty.description, "critical")
critical_assets = client.assets.aggregate_cardinality_values(
    AssetProperty.metadata_key("timezone"),
    advanced_filter=is_critical)
count = client.assets.aggregate_count()

from cognite.client.data_classes.filters import ContainsAny
from cognite.client.data_classes.assets import AssetProperty
has_timezone = ContainsAny(AssetProperty.metadata, "timezone")
asset_count = client.assets.aggregate_count(advanced_filter=has_timezone)
from cognite.client.data_classes.assets import AssetProperty
result = client.assets.aggregate_unique_properties(AssetProperty.metadata)
from cognite.client.data_classes.assets import AssetProperty
result = client.assets.aggregate_unique_values(AssetProperty.metadata_key("timezone"))
print(result.unique)

from cognite.client.data_classes import filters
from cognite.client.data_classes.assets import AssetProperty
from cognite.client.utils import timestamp_to_ms
from datetime import datetime
created_after_2020 = filters.Range(AssetProperty.created_time, gte=timestamp_to_ms(datetime(2020, 1, 1)))
result = client.assets.aggregate_unique_values(AssetProperty.labels, advanced_filter=created_after_2020)
print(result.unique)

from cognite.client.data_classes.assets import AssetProperty
from cognite.client.data_classes import aggregations
from cognite.client.data_classes import filters
not_test = aggregations.Not(aggregations.Prefix("test"))
created_after_2020 = filters.Range(AssetProperty.last_updated_time, gte=timestamp_to_ms(datetime(2020, 1, 1)))
result = client.assets.aggregate_unique_values(AssetProperty.labels, advanced_filter=created_after_2020, aggregate_filter=not_test)
print(result.unique)

Aggregate aggregateResult = client.assets() 
      .aggregate(Request.create().withFilterParameter("source", "")); 

curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/assets/aggregate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "aggregate": "count",
  "advancedFilter": {
    "and": "<array>"
  },
  "filter": {
    "name": "<string>",
    "parentIds": [
      4503599627370496
    ],
    "parentExternalIds": [
      "my.known.id"
    ],
    "rootIds": [
      {
        "id": 4503599627370496
      }
    ],
    "assetSubtreeIds": [
      {
        "id": 4503599627370496
      }
    ],
    "dataSetIds": [
      {
        "id": 4503599627370496
      }
    ],
    "metadata": {},
    "source": "<string>",
    "createdTime": {
      "max": 1,
      "min": 1
    },
    "lastUpdatedTime": {
      "max": 1,
      "min": 1
    },
    "root": true,
    "externalIdPrefix": "my.known.prefix",
    "labels": {
      "containsAny": [
        {
          "externalId": "my.known.id"
        }
      ]
    }
  }
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{cluster}.cognitedata.com/api/v1/projects/{project}/assets/aggregate",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'aggregate' => 'count',
    'advancedFilter' => [
        'and' => '<array>'
    ],
    'filter' => [
        'name' => '<string>',
        'parentIds' => [
                4503599627370496
        ],
        'parentExternalIds' => [
                'my.known.id'
        ],
        'rootIds' => [
                [
                                'id' => 4503599627370496
                ]
        ],
        'assetSubtreeIds' => [
                [
                                'id' => 4503599627370496
                ]
        ],
        'dataSetIds' => [
                [
                                'id' => 4503599627370496
                ]
        ],
        'metadata' => [
                
        ],
        'source' => '<string>',
        'createdTime' => [
                'max' => 1,
                'min' => 1
        ],
        'lastUpdatedTime' => [
                'max' => 1,
                'min' => 1
        ],
        'root' => true,
        'externalIdPrefix' => 'my.known.prefix',
        'labels' => [
                'containsAny' => [
                                [
                                                                'externalId' => 'my.known.id'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{cluster}.cognitedata.com/api/v1/projects/{project}/assets/aggregate"

	payload := strings.NewReader("{\n  \"aggregate\": \"count\",\n  \"advancedFilter\": {\n    \"and\": \"<array>\"\n  },\n  \"filter\": {\n    \"name\": \"<string>\",\n    \"parentIds\": [\n      4503599627370496\n    ],\n    \"parentExternalIds\": [\n      \"my.known.id\"\n    ],\n    \"rootIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"assetSubtreeIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"dataSetIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"metadata\": {},\n    \"source\": \"<string>\",\n    \"createdTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"lastUpdatedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"root\": true,\n    \"externalIdPrefix\": \"my.known.prefix\",\n    \"labels\": {\n      \"containsAny\": [\n        {\n          \"externalId\": \"my.known.id\"\n        }\n      ]\n    }\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://{cluster}.cognitedata.com/api/v1/projects/{project}/assets/aggregate")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"aggregate\": \"count\",\n  \"advancedFilter\": {\n    \"and\": \"<array>\"\n  },\n  \"filter\": {\n    \"name\": \"<string>\",\n    \"parentIds\": [\n      4503599627370496\n    ],\n    \"parentExternalIds\": [\n      \"my.known.id\"\n    ],\n    \"rootIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"assetSubtreeIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"dataSetIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"metadata\": {},\n    \"source\": \"<string>\",\n    \"createdTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"lastUpdatedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"root\": true,\n    \"externalIdPrefix\": \"my.known.prefix\",\n    \"labels\": {\n      \"containsAny\": [\n        {\n          \"externalId\": \"my.known.id\"\n        }\n      ]\n    }\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "items": [
    {
      "count": 10
    }
  ]
}

{
  "error": {
    "code": 400,
    "message": "`null` values aren't allowed."
  }
}

{
  "error": {
    "code": 429,
    "message": "Project exceeded maximum number='50' of concurrent requests. Please try again later."
  }
}