Good everyone, this is my first request.
I have this stochastic indicator I wish that every time the indicator touches specific levels it generates an alert and an arrow.

I mean if it touches the level of 10 and after 15 the alert and the arrow will go out.

but if it only touches the 10 level and not the 15 level it will not generate an alert and an arrow.

That the levels are configurable

Here is a graphic example

Thank you very much to the one who has the ability to collaborate.