warning-minimum-level

warning-minimum-level is a variable defined in `warnings.el'.
Its value is

:warning

Documentation:
Minimum severity level for displaying the warning buffer.
If a warning's severity level is lower than this,
the warning is logged in the warnings buffer, but the buffer
is not immediately displayed. See also `warning-minimum-log-level'.

You can customize this variable.

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