Stopping ale from opening preview windows with LSP warnings

[jwodder]

I recently set up ale with rust-analyzer in Vim 9.0.2100; you can see my ale configuration here. When I start up a new Vim session on a Rust source file, about 5% to 10% of the time, an ALEPreviewWindow opens up within a few seconds of starting containing a message of the form:

Error:analyzer: overly long loop turn took 116.362183ms (event handling took 53.198µs): Notification { method: "textDocument/didChange" }

According to rust-lang/rust-analyzer#3959, these messages are effectively noise and can be ignored. How do I get rust-analyzer to stop opening a window whenever these occur?