+B<Note>: Prior to version 4.4 of collectd, the data-set type used to be passed
+as the first argument to B<plugin_register>. This syntax is still supported
+for backwards compatibility but has been deprecated and will be removed in
+some future version of collectd.
+
+=item B<plugin_flush> ([B<timeout> => I<timeout>][, B<plugins> => I<...>][,
+B<identifiers> => I<...>])
+
+Flush one or more plugins. I<timeout> and the specified I<identifiers> are
+passed on to the registered flush-callbacks. If omitted, the timeout defaults
+to C<-1>. The identifier defaults to the undefined value. If the I<plugins>
+argument has been specified, only named plugins will be flushed. The value of
+the B<plugins> and B<identifiers> arguments may either be a string or a
+reference to an array of strings.
+
+=item B<plugin_flush_one> (I<timeout>, I<plugin>)
+
+This is identical to using "plugin_flush (timeout =E<gt> I<timeout>, plugins
+=E<gt> I<plugin>".
+
+B<Note>: Starting with version 4.5 of collectd, B<plugin_flush_one> has been
+deprecated and will be removed in some future version of collectd. Use
+B<plugin_flush> instead.
+
+=item B<plugin_flush_all> (I<timeout>)
+
+This is identical to using "plugin_flush (timeout =E<gt> I<timeout>)".
+
+B<Note>: Starting with version 4.5 of collectd, B<plugin_flush_all> has been
+deprecated and will be removed in some future version of collectd. Use
+B<plugin_flush> instead.
+