Reading 'Index Status' graph in Google Webmaster tools

Posted by sam on Pro Webmasters See other posts from Pro Webmasters or by sam
Published on 2014-06-02T22:06:58Z Indexed on 2014/06/03 3:43 UTC
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I recently found a bunch of old files that had been ftp'ed to a live production server by mistake on a static (html / css / js) site.

I manually deleted these files, but today when checking in Google Webmaster tools i found this graph below. The 'update' marker is from 3/9/14, what i can work out is what Google is trying to tell me, are they saying that :

There was a ranking update like Penguin or Panda and they penalized my site and un-indexed a load of pages which they thought were junk..

OR

Is this showing that I updated the site by deleting the files on the server on 3/9/14

OR

Is this something else ?

graph

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