v1806 - sampledSurface - Missing functionality - "average"

In the current version of OpenFOAM, previously existing functionality of the sampledSurface to also calculate average of a given field over the sampled surface has ceased to exist.

This has resulted in breaking custom in-house solvers and function objects which depend on this function.

Could someone please recommend changes required to be made to the custom code, so as to minimise disruption of downstream code, and so that I can maintain the base concept used in the custom solvers. It would be highly inefficient if I have to re-concenptualise the solver to work around this missing functionality.

Thank you.

Regards,
Philippose Rajan