I'm glad to see people championing the effort to implement metering. Is there someway to refocus the enthusiasm for solving the metering problem into engineering a general solution in OpenStack?
I'm just going to apologize in advance, but I don't think this project is headed in the right direction. I believe metering should be a first class concern of OpenStack and the way this project is starting is almost exactly backwards from what I think a solution to metering should look like. The last thing I want to see right now is a blessed OpenStack metering project adding more agents, coupled to a particular db and making policy decisions about what is quantifiable. I think there are really three problems that need to be solved to do metering, what data to get, getting the data and doing things with the data. >From my perspective, a lot if not all of the data events should be coming out of the services themselves. There is already a service that should know when an instance gets started by what tenant. A cross cutting system for publishing those events and a service definition for collecting them seems like a reasonable place to start. To me that should look awful lot like a message queue or centralized logging. Once the first two problems are solved well, if you are so inclined to collect the data into a relational model, the schema will be obvious. If the first two problems are solved well, then I could be persuaded that a service that provides some of the aggregation functionality is a great idea and a reference implementation on a relational database isn't the worst thing in the world. Without a general solution for the first two problems, I believe the primary focus on a schema and db is premature and sub-optimal. I also believe the current approach likely results in a project that is generally unusable. Does anyone else share my perspective? Maybe I'm the crazy one... Andrew
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