//
// Macro for use ...
//
bc = "buffer_cache";
// Using the above macro; If the buffer cache is in use (more than 50 read
// requests) with hit ratio less than 90%, then popup an alarm
//
$bc.getblks > 50 && $bc.getfound / $bc.getblks < 0.9
    -> alarm "poor buffer cache hit rate";
