Today my app had a serious problems for a couple of hours. I am trying 
to understand what went wrong and how to prevent this in future. I think 
this was a problem of appengine and memcache service was not responding for 
a while. I am making a conclusion like this because in logs I find a big 
number of requests which died like this:

<...> 

File 
"/base/python_runtime/python_lib/versions/1/google/appengine/api/memcache/__init__.py",
 
line 619, in __get_hook
rpc.check_success()
<...>
File 
"/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_rpc.py",
 
line 119, in Wait
rpc_completed = self._WaitImpl()
File 
"/base/python_runtime/python_lib/versions/1/google/appengine/runtime/apiproxy.py",
 
line 131, in _WaitImpl
rpc_completed = _apphosting_runtime___python__apiproxy.Wait(self)
DeadlineExceededError


However 
http://code.google.com/status/appengine<http://code.google.com/status/appengine/detail/memcache/2012/01/29#ae-trust-detail-memcache-get-latency>
 does 
not show any problems. So I am not sure.

Here is todays graph with milliseconds/request:


<https://lh4.googleusercontent.com/-q9PdPRkd_e0/TyW94risJeI/AAAAAAAAAA8/vJSeaBgCawk/s1600/disruption.png>

If this was a problem of appengine how can I prove that and how can I get a 
refund for resources wasted by many instances which where started during 
these hours?

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