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How to find what resources exceed free tier

Hello,
I recently installed a program called Teslamate on a new Google Cloud VM using these instructions:

https://www.teslaev.co.uk/how-to-setup-and-run-teslamate-for-free-on-google-cloud/

After several days of usage, my daily GCP costs went up dramatically.  I'm guessing this is because the VM exceeded free tier usage at some point, but I can't find a way to see the details of what particular resource (e.g. cpu, memory, network connections/bandwidth) was exceeded.  I don't expect Teslamate to require significant resources, so I believe there may be a problem with my configuration setup that I may be able to resolve if I knew what was driving up the usage/cost.  

Finally, I am familiar with the resource monitoring and utilization graphs/reports available on GCP, I just don't know how to tie that back to billing, especially for the instance that the significant cost increase happened.

Any help/direction is appreciated. Thank you.

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