1. A process for reconciling billing measures to cost factors, the process comprising: by one or more processors that provide an adjustable tenant billing to cost mechanism as a platform service from a platform-as-a-service (PaaS) layer within a distributed multi-tenant computing environment that comprises multiple distinct host computing platforms: receiving, at the PaaS layer over at least one application feed from at least one software-as-a-service (SaaS) application operating in a SaaS layer within the distributed multi-tenant computing environment, a set of client-application billing measures of multi-tenant computing services; receiving, at the PaaS layer over at least one infrastructure feed from at least one multi-tenant platform host operating in an infrastructure-as-a-service (IaaS) layer within the distributed multi-tenant computing environment, a set of service-provider cost factors of a plurality of different types of platform and infrastructure components used to provide services within the multi-tenant computing environment; analyzing the set of client-application billing measures and the set of service-provider cost factors using a set of defined relationships within the PaaS layer that identify influence of the set of client-application billing measures in the SaaS layer on the set of service-provider cost factors in the IaaS layer; and adjusting, in accordance with the analysis using a feedback mechanism within the multi-tenant computing environment, the set of defined relationships within the PaaS layer that identify the influence of the set of client-application billing measures in the SaaS layer on the set of service-provider cost factors in the IaaS layer.