Right now we have number of CBR and number of MP calls available in the server metrics. As the number of total ranker calls depends wrt. the CBR and MP calls depend on the fallback mode the clear knowledge on how many times the ranker was called is unclear. In the current scenario with the MP trial period the number of MP runs is equal to the number of ranker calls. Yet if we run vanilla CBR then this will not be true anymore. This ticket should create a server metric to track how many times the ranker was called.