Yes the full recipe is:

• 1 Flask API for sending custom HTML to Glance
• 1 systemd unit + python script for the right graph (last 60 minutes, resetting counter and collecting data via nftables python module)
• 1 systemd unit + python script for the left graph (last 24h, aggregate data from the last hour collevted by the first script And that’s it, the systemd units are used to schedule python scripts and all the data are stored in flat csv file