title: Selectively suppress custom Obsolete warnings
body: <p>I'm using the <code>Obsolete</code> attribute (as just suggested by fellow programmers) to show a warning if a certain method is used.</p>
  <p>Is there a way to suppress the warning similar to CodeAnalysis' <code>SuppressMessage</code> at points where the use is justified?</p>
  <p>This needs to work for <code>[Obsolete(&quot;Some message&quot;)]</code> which generates warning 618 and the plain <code>[Obsolete]</code> attribute with no message which generates warning 612.</p>