One of my site got deindex recently - no "site:" result and no domain name search result. I've read that when you got deindexed, an alert will be shown on your webmaster tools, and a link to request reconsideration will be there. Thing is, I don't see any alert/notification on my webmaster tools and started to think that - may be it just something I setup wrong that got the site deindex by itself? I've checked and all the page still have index/follow. But the sitemap.xml is broken for a few weeks until now and I didn't aware of that. The site in question is an auto blog with just 1,000 pages. Any input on these?