Internet Metrics & Reach
Alexa rankings and other web visitor statistics services can help to determine the legitimacy of your web visitors and provide independent verification of your audience reach, which is useful for advertisers and trading partners. Most web site owners will want to select all of these bots. If you don't want these services ranking your web visitor levels, you can exclude them.
Yandex Metrika bot
YandexMetrica is the Russian equivalent of Google Analytics, only it's much better than GA. The Yandex.Metrica bot doesn't respect a general robots.txt disallow, but can be disallowed by referencing the agent YandexMetrika.
Free web visitor statistics, including unique visits, time on the site, and Alexa data if available
Riddler is an online research project which investigates algorithms for mapping the topology of the Internet. Riddler collects data about public systems via crawling and port mapping common ports.
DomainName of our bot: DomainStatsBotUser Agent: DomainStatsBot/1.0 (https://domainstats.com/pages/our-bot)Obeys Robots.txt: YesCategory: Marketingstats allows you to gather key information about webdomains.