8.4. Pay-Per-Use Monitor ( Specialized Cloud Mechanisms Unit 3 chapter 1)

8.4. Pay-Per-Use Monitor

The pay-per-use monitor mechanism measures cloud-based IT resource usage in accordance with predefined pricing parameters and generates usage logs for fee calculations and billing purposes.
Some typical monitoring variables are:
• request/response message quantity
• transmitted data volume
• bandwidth consumption
The data collected by the pay-per-use monitor is processed by a billing management system that calculates the payment fees.
The billing management system mechanism is covered in Chapter 9.
Figure 8.12 shows a pay-per-use monitor implemented as a resource agent used to determine the usage period of a virtual server

Figure 8.12. (1) A cloud consumer requests the creation of a new instance of a cloud service .
(2)The IT resource is instantiated and the pay-per-use monitor receives a “start” event notification from the resource software.
(3)The pay-per-use monitor stores the value timestamp in the log database .
(4)The cloud consumer later requests that the cloud service instance be stopped .
(5)The pay per-use monitor receives a “stop” event notification from the resource software
(6)stores the value timestamp in the log database .

Figure 8.13 illustrates a pay-per-use monitor designed as a monitoring agent that transparently intercepts and analyzes runtime communication with a cloud service.

Figure 8.13. (1)A cloud service consumer sends a request message to the cloud service .
(2)The pay-per-use monitor intercepts the message ,
(3a)forwards it to the cloud service ,
(3b)and stores the usage information in accordance with its monitoring metrics .
(4)The cloud service forwards the response messages back to the cloud service consumer to provide the requested service .

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