When multiple projects share one Foundry resource, grouping costs only by Azure resource cannot distinguish project consumption because the resource boundary is shared. Microsoft Foundry integrates with Azure Cost Management by attributing model usage to project metadata/tags, allowing a Cost Analysis view to filter shared resource spending by project. This supports showback or chargeback without requiring administrators to manually tag every usage event. Subscription-level service filters or meter grouping identify the service or billing meter but not which of the three business-unit projects generated the usage. Therefore a Foundry-resource-scoped Cost Analysis view filtered by the project tag is the configuration that both reconciles to Azure Cost Management and minimizes manual tagging. D remains correct. The evaluation should also preserve correlation identifiers and version information where possible so a failed score can be traced back to the exact agent, model, tool call, or retrieval step that produced it. This turns the metric into an actionable diagnostic rather than only a dashboard number.

Official Microsoft reference: Microsoft Foundry - Manage costs