Hi Harika,
It looks like you are getting unexpected null values. For this would you please consider opening up a bug report / new issue on our github repository with more detailed information to investigate this further?
For your second point, could you please elaborate if you are trying to understand the specific embodied emissions calculations or the more general compute estimations? If there is any part of our documentation that is not making sense, could you please let us know specifically so that we could look into updating it?
Lastly, if the instance type is missing, we consider this an unknown usage type. You can refer
here for more information. If it is returning null, this would indeed be a bug.
Thanks,
CCF Team