curl --request GET \
  --url https://api.coralogix.com/mgmt/openapi/3/notifications/notification-center/v1/connectors:getTypeSummaries \
  --header 'Authorization: <api-key>'

{
  "connectorTypeSummaries": [
    {
      "count": 5,
      "type": "CONNECTOR_TYPE_UNSPECIFIED"
    }
  ]
}