Constant NOTIFICATION_BATCH_MAX_BYTES 

pub const NOTIFICATION_BATCH_MAX_BYTES: usize = _; // 182_068usize

Largest complete UpdateSubscriptions protobuf, excluding the gRPC header. Two 32-byte credentials, full adds with 33-byte topics, maximum nonnegative epoch bases, include_commits, and 42-byte keys; includes all field wrappers.