Introduction - If you have any usage issues, please Google them yourself
RRDtool data to detect whether there are exceptions, such as the flow rate is relatively stable, but due to some unexpected reasons, resulting rrdtool generated images fluctuate. Or it can be used for early warning, the timing of this script executed once per minute*, it will retrieve this if every rrd files in the specified directory abnormal data. If there is an alarm automatically send e-mail.