Not sure if this was posted before. But i've made a small utility to take accounting data from a mikrotik router, push the data to InfluxDB and then can display very nice chart in Grafana.
Here is an simple example of what you can get in grafana:
You can find more info about it here:
Let me know if you find this useful, have any comments or if you encounter any bug. I'll be happy to improve this project.