Storing time-series data, relational or non?

Question

I am creating a system which polls devices for data on varying metrics such as CPU utilisation, disk utilisation, temperature etc. at (probably) 5 minute intervals using SNM

Answer 1

You should look into Time series database. It was created for this purpose.

A time series database (TSDB) is a software system that is optimized for handling time series data, arrays of numbers indexed by time (a datetime or a datetime range).

Popular example of time-series database InfluxDB