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A general description is here.
The legacy S-compatibility macros ‘PROBLEM’, ‘MESSAGE’, ‘ERROR’, ‘WARN’, ‘WARNING’, ‘RECOVER’, ... are deprecated and will be hidden in R 4.2.0. R's native interface of ‘Rf_error’ and ‘Rf_warning’ has long been preferred.
New palettes ‘"Rocket"’ and ‘"Mako"’ for ‘hcl.colors()’ (approximating palettes of the same name from the ‘viridisLite’ package).
Contributed by Achim Zeileis.