Is Monogodb down?

Here is my log:
–start–
[Tue Dec 15 2015 11:09:41 GMT+0000 (UTC)] NOTICE Starting application on port
22956
[Tue Dec 15 2015 11:09:41 GMT+0000 (UTC)] INFO STATUS waiting -> starting
[Tue Dec 15 2015 11:09:41 GMT+0000 (UTC)] INFO STATUS starting -> running
[Tue Dec 15 2015 11:09:42 GMT+0000 (UTC)] WARNING
/meteor/dev_bundles/0.5.16/lib/node_modules/fibers/future.js:278
throw(ex);
^
[Tue Dec 15 2015 11:09:43 GMT+0000 (UTC)] WARNING Error: No valid replicaset
instance servers found
[Tue Dec 15 2015 11:09:43 GMT+0000 (UTC)] INFO STATUS running -> waiting
[Tue Dec 15 2015 11:09:43 GMT+0000 (UTC)] ERROR Application crashed with code:
8
–end–
When attempting to get to mongo via the command prompt, I get:
Couldn’t open a mongo connection: Service temporarily unavailable. Please try
again later.

I am having the exact same issue. It started 5-6 hours ago and has not been resolved until now

Yes, unfortunately some sites are experiencing outages due to problems with the Mongo cluster. This is part of a larger issue with Mongo that we are working on (see this comment). We will give status updates here as this is sorted out.