RestartManager, Event ID 10010 warning demystified

Today's piece shalt be nerdy, nerdy shalt be today's piece. This is a somewhat niche but hopefully useful tutorial on how to troubleshoot Event Log messages related to RestartManager and seemingly inexplicable Application and Conductor SID warnings for random programs in Windows 10, including deeper overview of the problem, custom event filtering and comparison to other Windows machines, MSI package installation trigger and affected in-use DLL handles as the root of the problem, time sequence of multiple Information and Warning category events, alarming but unnecessary machine restart notifications, associated over-complexity and confusing data, some other details, and more. Do take a look, or something.