As a Midlane main who recently stepped into the Jungle role...
When Laners feel like the help form the Jungler (offensively or defensively) please ping "assist".
It's not an angry post, I actually feel really ashamed when I am roaming the jungle just to realize that a team mate has been driven out of lane or even killed. I feel like I should have been there and maybe focus my clear route aorund that lane rather then just go farming around.
I'm sure all Junglers feel a bit the same and as a Laner myself I learnt that Jungler proximity is the time where you can try do some risky things but do not expect a timely help, especially if you don't ask for it.