How to se vim.notify's log level?

I encounter some warning: warning: multiple different client offset_encodings detected for buffer, this is not supported yet, I know I should change lsps’s offset_encodings, but it’s impossible at this time.So I just hide this warning. I see this message is printed by vim.notify: neovim/util.lua at b455e0179b4288c69e6231bfcf8d1c132b78f2fc · neovim/neovim · GitHub

But I cannot find a function to set it’s log level. I tried using vim.lsp.set_log_level, but it’s useless.