I'm trying to estimate the cost of requests in a prototype app deployed in 
Google App Engine (free, not billing enabled) and I'm having some questions 
and issues. Right now, just to see if I could get things working I've just 
deployed some JSPs that generate some HTML.

Issues:

   1. I'm logged as an admin but not getting the 
   "X-AppEngine-Estimated-CPM-US-Dollars" header on JSP responses. Does this 
   only work for explicitly registered servlets? 
   2. I'm getting the "cpm_usd" value on admin console logs view, but not 
   on dowloaded logs. Is this value valid? Anyone got it compared with the one 
   on the headers? 
   3. How does static files cost work? I get mostly the same "cpm_usd" 
   value independently of file size or response code (200 or 304). I have not 
   defined a caching policy yet. 
   4. The "Quota Details" page says I have consumed 1% of my free "Incoming 
   Bandwidth" but 0% of "Outgoing Bandwidth". That's just impossible. Only 
   explanation I found is that there's a bug and the values are interchanged. 
   5. It seems that full uptime instance time (with those extra 15 min) is 
   only considered for billing, as my consumed free quota for that is 0% (so 
   it must be processing time). Is that correct?

More general pricing questions:

   1. About Reserved/Prepaid Frontend Instances: how do you "purchase" 
   them? How do they go along with the free 28 hours? Are resident frontend 
   instances (minimum idle instances) paid as reserved? Shouldn't they be? 
   2. About Backends: the free part is 9 hours or $0.72? (it's not the same 
   depending on the backend class)

Finally, if someone has any good advice, strategy or formula for estimating 
costs on GAE, they are very welcome to share them.

Thank you.

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