Man pages matching name graphics::primitive::paint::gradient in section 3pm:

Graphics::Primitive::Paint::Gradient.3pm.en	debian 10 / libgraphics-primitive-perl
Graphics::Primitive::Paint::Gradient.3pm.en	debian 11 / libgraphics-primitive-perl
Graphics::Primitive::Paint::Gradient.3pm.en	debian 12 / libgraphics-primitive-perl