I was tasked with making a health bar for the team vehicle for our cooperative extraction looter game. 
 

Requirements
- Show the amount of health remaining
- Show that the vehicle needed to be repaired

Extras I wanted
- Show when the vehicle is damaged

- Show when a repair point has appeared

- Show how many repair points are waiting for attention

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The vehicle health bar is divided up into 10 or so segments and as the vehicle takes damage, players can see the health go down on a segment and when it drops below a segment threshold, a new repair point would appear. When a repair point is fixed, a segment of health is restored. 

The journey we went through to reach the final version involved many iterations and design changes related to the shifting priorities in the game, but it eventually settled on what I think is the best version of the system. You can see the journey the health system went through in the video.

Playtests show that people understand that health is being lost, but some people don't connect the repair points to the segments until after their first repair. Wreck Runners falls into the friendslop/friendjank genre which gives a lot more grace for game mechanic discovery and players are more willing to share information with each other. Until more feedback comes in on this topic, I think that enough players will see a repair point, interact with it and see the health bar react to the repair to propagate the knowledge effectively.