How to access droplet-specific bandwidth usage via API?

I am planning to create a managed hosting solution for my clients using DigitalOcean droplets. I could successfully go through all the operation/billing options using digitalocean API, except the overuse of bandwidth.

The digitalocean api https://docs.digitalocean.com/reference/api/api-reference/#operation/get_user_information does not provide metric tracking such as cpu usage, memory usage, and transfer.

I went through the following options options:

1. Install DigitalOcean agent (https://www.digitalocean.com/community/questions/how-to-check-bandwidth-usage-in-december-2020), which may lead us to revoke the root access as the malicious customer might mess up the metric tracking. This might be the case of cloudways.

2. Manually tracking metrics based on billing, which seems counterproductive.

I’m not sure about how Laravel Forge and ServerPilot tracks the bandwidth usage. Is there any other way to track them seamlessly while also granting root access to the user?