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+//
+// at least $threshold full and at the current rate of growth will fill
+// the file system in less than $lead_time
+// ie. used + $lead_time * growth-rate > capacity
+
+delta = 1 min; // check every minute
+threshold = 40; // must be at least this full now (percentage)
+lead_time = "15min"; // lead time before the filesystem will be full
+
+some_inst (
+ 100 * filesys.used / filesys.capacity > $threshold &&
+ filesys.used + $lead_time * ( rate filesys.used ) >
+ filesys.capacity
+) -> print "filesystem will be full within $lead_time:" " %i";