Prebid Floors: Add modelWeight to Analytics endpiont

[bszekely1]

Type of issue

Enhancement

Description

When the Floors Module is schema mode 2, the floors module picks a model prior to an auction based on the modelWeight supplied in the floors module definition. Today the Floors Module adds the modelVersion selected to the bidRequest object to allow floor providers context of the model applied. The goal of this ticket is to add the modelWeight attribute to the bidRequest object to give additional context for Analytics adapters.

bidRequest location bidRequest.bids[ ].floorData.modelWeight.

[bszekely1]

Docs when ready: prebid/prebid.github.io#2576