Install ruby-rrd by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-rrd
Description:
time-series data storage and display system (Ruby interfaces)
The Round Robin Database Tool (RRDtool) is a system to store and display time-series data (e.g. network bandwidth, machine-room temperature, server load average). It stores the data in Round Robin Databases (RRDs), a very compact way that will not expand over time. RRDtool processes the extracted data to enforce a certain data density, allowing for useful graphical representation of data values. . This package contains a Ruby interfaces to RRDs.
Homepage: http://oss.oetiker.ch/rrdtool/
Version: 1.7.0-1build1
Section: universe/ruby