I have:

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Drag or paste a zip folder containing your icon as a minimal SVG file. We just need the SVG tag with the viewbox and a single path element.
factory-reset.zip
Nice first contribution! You're definitely on the right track, but there are a few things we'll need to address. Let's go through those and make this ready-to-add.
restore. Let's use this as the base icon. This also puts the circle on the grid.Making those changes we get:
Notice how much crispier the exclamation point looks in the center of the icon at native resolution. That's the goal.
Again, nice work! We'll assign this icon to the global Contributor account until you reach a total of 5 icons added. When that happens, let us know and we'll reassign these to you. 馃槃
Might as well mirror it and add reload-alert as well.
Dear gogney,
thanks first of all. Actually I got the circle from "lock-reset" and didn't change it at all, but I get what you mean. I'd just like to add 2 quick things:
Always work in SVG. You need to make sure everything lines up with the 24dp grid though so when the SVG is rendered it appears crisp and pixel aligned. You should be working on a 24x24 canvas/viewbox and most (if not all) of the points should land on whole numbers.
We will be going with the names @goyney used as we are basing these icons on ones we already have so these are just alert variants of those existing icons. We may however add factory-reset as an alias so it will appear in searches.
Most helpful comment
Always work in SVG. You need to make sure everything lines up with the 24dp grid though so when the SVG is rendered it appears crisp and pixel aligned. You should be working on a 24x24 canvas/viewbox and most (if not all) of the points should land on whole numbers.
We will be going with the names @goyney used as we are basing these icons on ones we already have so these are just alert variants of those existing icons. We may however add
factory-resetas an alias so it will appear in searches.