warning-suppress-log-types

warning-suppress-log-types is a variable defined in `warnings.el'.
Its value is

nil

Documentation:
List of warning types that should not be logged.
If any element of this list matches the TYPE argument to `display-warning',
the warning is completely ignored.
The element must match the first elements of TYPE.
Thus, (foo bar) as an element matches (foo bar)
or (foo bar ANYTHING...) as TYPE.
If TYPE is a symbol FOO, that is equivalent to the list (FOO),
so only the element (FOO) will match it.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.