Cortex-tenant equivalent for OTLP endpoint #7368

Hi,
I wanted to check if we have any application similar to "cortex-tenant" to extract tenant id information from request payload and set it as header when invoking Cortex OTLP endpoint - https://cortexmetrics.io/docs/guides/use-opentelemetry-collector-to-send-metrics-to-cortex/#push-with-otlp-format. Or if Cortex internally has a way to configure this instead of building bespoke application for this functionality.