https://www.sqlskills.com/help/latches/spacemgr_iam_page_range_cache/
SQL Server SPACEMGR_IAM_PAGE_RANGE_CACHE Latch
Dec 18, 2020 - This page explains the SPACEMGR_IAM_PAGE_RANGE_CACHE latch class and gives examples of where it occurs in SQL Server.
sql serveriamrangecachelatch