The first symbol should be the custom group that you use for the program’s user options. For example, byte compiler warnings use the warning type (bytecomp).
And some other packaged use their own named symbol for that.
Current plantuml-mode uses :warning for that,
but it may be for 3rd (and optional) parameter of display-warning.
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1st parameter for
display-warning
is used as part of warning message. https://www.gnu.org/software/emacs/manual/html_node/elisp/Warning-Basics.html#Warning-Basics saysAnd some other packaged use their own named symbol for that.
Current plantuml-mode uses
:warning
for that, but it may be for 3rd (and optional) parameter ofdisplay-warning
.