As well as I know, the Siebel is not supported by Dynatrace.
Please have a look at the below link for technicalogy support.
I am thinking of using that only . The scenario is that i don't have a Seibel instance where i can install one agent and check the metrics .
My exact query about the metrics is : Is there any metric which can show a failed order ? For example if the customer wants to track if any order has failed , can they track that using any Dynatrace metric ?