Sure - the issue is we (the public reading this) don't know when this actually physically failed. It could be that SRE picked up on this before a scheduled walk

Sure - the issue is we (the public reading this) don't know when this actually physically failed. It could be that SRE picked up on this before a scheduled walkthrough (of which I'm sure occurs) happened. Disclaimer: Google employee. No knowledge of this event beyond the blog post.