I only have one miner at Chengdu, and it reports 4 hours down. Unusually though, I don't see the whole four hours down anywhere, so that's a bonus. However, it was below it's normal levels and with gaps you can see in the image.

I now lost all Neimeng miners They went mia at 8:42 CDT, but the web portal doesn't say they are down. However, the last update is delayed for these miners, with the last time being before the downed time.

The miner monitor website is now having troubles as well. I wonder if Neimeng down causes that or the repair process makes it have errors. Really wish we had more updates here.

This is getting weird. Miners are now mining, the website is working again, but the Neimeng update times are still static and I got no credits listed for today.

For example, a Neimeng miner last update: 2015/4/15 8:22:53
For Chengdu: 2015/4/15 11:44:33

Looking at one miner, it seems it was down for 2 hours 10 minutes, with a whole mess of short downtime spans before that.

The website seems to have just added a client feedback page. I don't think I've seen it earlier.

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Update: 2015/4/15 12:20AM CDT
Even more weird now. The website shows all my Neimeng miners as offline, but they are mining where they should be.

Final Update:
Neimeng miners are showing online and they are mining, and back being checked on the website. Sadly, there was no automatic count of the hours down. So everyone needs to make a note of today and include your calculations, if needed, when it comes to the monthly refund if the downtime exceeds 2%.

@clgrissom3, no update of downed hours for me, the last downtime entry I have is for Chengdu for the 14th.

Thankfully this is the first event I have to make note of, and I hope not to make the 2% down, for it even to count.

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Wow, the 9th to the 11th things were running great across the board, then the start of the 12th and after it's been pitiful. I wonder what's changed.

Just so no one is surprised by this but there will be more NeiMeng-1 downtime about 8.5 hours from the time of this post.  This notice was posted on the News and Notification screen of the Miner Monitor.

"2015/4/15 23:31:20   The neimeng DC will proceed maintenance for 12 hours   

The maintenance will start at 8:00 AM and end at 8:00 PM, 16th Apr(Beijing Time, GMT +8), total 12 hours, the downtime will be counted on customer account . Sorry for the problem it bring and thanks for using our service. we will clean the dust during this time to make miner running more stable after maintenance."

sorry for the trouble the maintenance bring, i should post in the thread as well, but i am on a travel yesterday, and canot visit bitcointalk forum without vpn
so i only update it on monitor system, the maintenance should no happen every month

Must be specific to your account. Mine has updated.

The downtime calculation is automatic, and it will start to calculate when your miner is shown as offline on monitor system, whether it is real offline on pool side