The current memory usage level
-normal(1)
The Memory usage is within normal usage limits, <= 80% of configured maximum database size.
-high(2)
The memory usage level is high. Memory usage is more than 80% and less than or equal to 90% of configured maximum database size.
-critical(3)
The memory usage level is at critical level. Memory usage is more than 90% of configured maximum database size.
-maximum(4)
The memory usage level reached to maximum. Memory usage almost at 98% or more of configured maximum database size.