User-agent: Yandex
Crawl-delay: 2

User-agent: Googlebot
Crawl-delay: 2
Disallow: /*utm_

User-agent: Slurp
Crawl-delay: 8
Disallow: /*utm_

User-agent: *
Crawl-delay: 10
Disallow: /*utm_

Clean-param: utm_source&utm_medium&utm_term&utm_campaign /