Recently I found myself in a position where I was required to gather information on events occuring to a VPS (Virtual Private Server) running Linux OS. Having close to no experience with this system, I searched for the best tools for the job. Happily though, the internet is filled with resources on this subject, a few of which I would like to share now;
Even though outdated, this blog entry about Linux monitoring tools contains the description of 80 (!) tools that can be easily accessed and used for this purpose: https://blog.serverdensity.
If historical data is what you need, you might want to take a look at the following blog entry about the most important Linux log files: https://www.eurovps.com/blog/
Hopefully you found this little article informative and can use it as a starting point in the search of the solution for your needs.