Add issue weight indicator on the issue cards in the issue board
This was originally posted here https://gitlab.com/gitlab-org/gitlab-ce/issues/25422, but when it was moved to https://gitlab.com/gitlab-org/gitlab-ee/issues/1379, it changed to address showing the info in the sidebar instead of on the card itself.
In addition to the original motivation, I would like to add that a benefit of having the weight appear on all issue cards versus only in the side bar when an issues is selected, is that it is much quicker to get an overview and compare the complexity of issues. This might sound trivial at first, but it is actually highly valuable information for prioritizing issues up and down one of the lists on the board, which is often one of the main activities when using the issue board.
A small symbol and a number like in the original suggestion looks good (or even just a number if the symbol is considered to take up too much space, explanatory text can be added on hover):
Design
Issue card weight indicator: