Function checked_blob_gas_used_ratio 

pub fn checked_blob_gas_used_ratio(
    blob_gas_used: u64,
    max_blob_gas_per_block: u64,
) -> f64

Available on crate feature rpc only.

Calculates the blob gas used ratio for a block, accounting for the case where max_blob_gas_per_block is zero.

Returns 0.0 if blob_gas_used is 0, otherwise returns the ratio blob_gas_used/max_blob_gas_per_block.