Usage reporting of Cloud provided PostgreSQL service

Hi All,

I would like to know what are the best practices in terms of usage
reporting of databases size in cloud setup.

One specific question related to the consideration of indexes

If i am providing PostgreSQL as a service in a cloud platform , should i
consider index size also in the consumption metrics ?

For e.g. does Amazon AWS RDS consider the index size in storage metric ?

Best Regards,
Saurav