How to show total lines of file

at `lua/plugins/lualine/config.lua:93` the status line shows "filesize" which is the total characters of a file. I find this useless, and want to show total lines of file. What is the correct keyword? <img width="1352" alt="图片" src="https://github.com/hardhackerlabs/oh-my-nvim/assets/55350008/3e333e39-70fe-4cba-b2ea-3ad729587ed7">