I have been running two MediaWiki Sites for a long time without problems. In the summer I made a redesign with small changes in the MediaWiki code.
Problem: No single pictures are more in the Google-Images search available. (Checked via www.google.com/search?tbm=isch&q=site:mysite.com)
More specifically, every Image via [[File:filename.extension|options|caption]] are not available in the search results. I testet it: other Images included via html code <img src="image.jpg"> are crawled and are show in image search, but every "[[File:filename..." not.
I also checked my robots.txt and .htaccess file, everything looks good and nothing is locked. (Webmaster Tools)
I remember that in the summer I only add meta robots to the File-Site (/wiki/File:Example.jpg): <meta name="robots" content="noindex,follow" /> via $wgNamespaceRobotPolicies = array ( NS_FILE => 'noindex,follow', );
But now, I removed it and it is still not crawled by Google but 'with bing.com it works. Really strange.
What can it be that no Image included via MediaWiki Syntax is searchable, on both MediaWikis? The Article Page is crawled fine, but the images in de article are not visible in the search engine.
MediaWiki: 1.15.0 PHP: 5.6.29 MySQL: 5.5.53