How Bad Was Google's Deindexing Bug?

Posted by Dr-PeteOn Friday, April 5, after many website owners and SEOs reported pages falling out of rankings, Google confirmed a bug that was causing pages to be deindexed: MozCast showed a multi-day increase in temperatures, including a 105° spike on April 6. While deindexing would naturally cause ranking flux, as pages temporarily fell out of rankings and then reappeared, SERP-monitoring tools aren't designed to separate the different causes of flux. Can we isolate deindexing flux? Google's own tools ca...