One of the best ways to which I think bloggers can monitor traffic on their website is by using Nodequery. Though it is well adapted for huge businesses, I am sure you would like to adventure on this Public API. NodeQuery is currently in public beta and completely free of charge.
To install NodeQuery, you will need to register on the official website. You will be prompted to install the Agent on your machine by downloading it from Github using the command https://raw.github.com/nodequery/nq-agent/master/nq-install.sh
After installation, you need to launch the bash script and immediately after less than 3 minutes your server is being monitored.
For the free version, you have the possibilities to have a full overview of your system, Network Usage, Network latency, Average Load, Ram and Swap Usage, Disk Usage and the Top Processes.
Well, there are several more features to explore.
Cool isn't it?