Contrib RFC: Counters for Slow InnoDB Sync Reads

I just submitted a MySQL Contribution and I would like to gather feedback about it. Depending on the received feedback, I might submit an updated contribution. The contribution is Counters for Slow InnoDB Sync Reads, and its goal is to make MySQL easier to operate on “complex” IO subsystems (like network drives in the cloud). The bug report / feature request Bug #117740 :