How to monitor the dynamics of a parameter change in Linux

Question

linux

There is some systemic, constantly growing parameter. It can be easily obtained by reading a special file.
It is required in a visual form to display the dynamics of its change depending on time, I assume that some kind of graph will be used.

What kind of graph should be and how should it look to provide this information in the most convenient and visual way?

And by what means can this be organized in a Linux environment? Preferably something related to Python, well, or Bash, since they are the ones I am most familiar with.

Answer 1

RRDTool should do the job well, IMHO. There are bindings for Python.

Answer 2

Write a simple job for cron that will write the value to the log file, then read the log using a Python script and build a graph using MatPlotLib.