Google has updated the user agent for the AdsBot Mobile Web Android crawler. If you have hard-coded this bot for any purpose on your site, you will need to update your code.
new user agent for AdsBot Mobile Web Android teeth:
Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML like Gecko) Chrome/WXYZ Mobile Safari/537.36 (compatible; AdsBot-Google-Mobile; +http://www .google.com/mobile/adsbot.html)
of old user agent was:
Mozilla/5.0 (Linux; Android 5.0; SM-G920A) AppleWebKit (KHTML like Gecko) Chrome Mobile Safari (compatible; AdsBot-Google-Mobile; +http://www.google.com/mobile/adsbot.html)
forum discussion at twitter.
image credit @okaylizzi