Hi Matias Malpica,
Yes, it's OK to create additional local accounts. What is not supported, however, if using any Discovery functionality with it (i.e. running tw_* commands, etc.). What is also not supported is installation of additional software except for those outlined in the documentation: Third party software support
As a matter of interest, can you share what metrics/information you're looking for?
general monitoring (uptime, cpu, ram and disk)