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3.18.7 Article button levels

The higher the value of the variables gnus-button-*-level, the more buttons will appear. If the level is zero, no corresponding buttons are displayed. With the default value (which is 5) you should already see quite a lot of buttons. With higher levels, you will see more buttons, but you may also get more false positives. To avoid them, you can set the variables gnus-button-*-level local to specific groups (see Group Parameters). Here's an example for the variable gnus-parameters:

     ;; increase gnus-button-*-level in some groups:
     (setq gnus-parameters
           '(("\\<\\(emacs\\|gnus\\)\\>" (gnus-button-emacs-level 10))
             ("\\<unix\\>"               (gnus-button-man-level 10))
             ("\\<tex\\>"                (gnus-button-tex-level 10))))
gnus-button-browse-level
Controls the display of references to message IDs, mail addresses and news URLs. Related variables and functions include gnus-button-url-regexp, browse-url, and browse-url-browser-function.
gnus-button-emacs-level
Controls the display of Emacs or Gnus references. Related functions are gnus-button-handle-custom, gnus-button-handle-describe-function, gnus-button-handle-describe-variable, gnus-button-handle-symbol, gnus-button-handle-describe-key, gnus-button-handle-apropos, gnus-button-handle-apropos-command, gnus-button-handle-apropos-variable, gnus-button-handle-apropos-documentation, and gnus-button-handle-library.
gnus-button-man-level
Controls the display of references to (Unix) man pages. See gnus-button-man-handler.
gnus-button-message-level
Controls the display of message IDs, mail addresses and news URLs. Related variables and functions include gnus-button-mid-or-mail-regexp, gnus-button-prefer-mid-or-mail, gnus-button-mid-or-mail-heuristic, and gnus-button-mid-or-mail-heuristic-alist.