Constant bp_kusama::AVERAGE_ON_INITIALIZE_RATIO

pub const AVERAGE_ON_INITIALIZE_RATIO: Perbill;

All Polkadot-like chains assume that an on-initialize consumes 1 percent of the weight on average, hence a single extrinsic will not be allowed to consume more than AvailableBlockRatio - 1 percent.

This is a copy-paste from the Polkadot repo’s polkadot-runtime-common crate.