Currently, there is no direct way to measure the number of bytes read from the page server by a mongod instance. While the existing metric mongodb_wiredTiger_cache_bytes_read_into_cache can be used as a proxy to observe trends, it does not accurately align with the data seen on the page server.

This capability would provide more precise insights regarding the interaction between the mongod instance and the page server. A metric to directly measure bytes read from the page server would help improve observability and debugging of performance issues or discrepancies.