What is panel below editor that states: "No diagnostics. Well done!"

[depesz]

Hi,
I’m new user to sublime, and lately I’ve been using it to write some JS.
While working, sometimes, not always, when I press Ctrl-S to save, I get gray panel below editor. Sometimes it lists some problems, and sometimes it just says: “No diagnostics. Well done!”.

What is it, how can I get rid of it, where can I read more about it?

[bschaaf]

That’s certainly provided by a plugin you’ve installed.

[UltraInstinct05]

It’s probably coming from the LSP package that you have installed. By default LSP is set to show the diagnostics panel on save. You can turn it off by using Preferences: LSP settings from the command palette and setting the setting show_diagnostics_panel_on_save to 0