The excellent performance monitoring tool MangoHud v0.8.4 is out now, and it contains an important bug-fix with the Steam Overlay. You can use MangoHud to check things like FPS, frame timings, temperatures, CPU/GPU load, benchmarking and lots more features. Check out the GamingOnLinux Guide for more info on how to use it!
With a previous release it turns out it was butting heads with the Steam Overlay, so it wouldn't appear. I noticed it but thought it was a Proton issue but it was a MangoHud bug - nice to see it solved.

Pictured - MangoHud v0.8.4 on Fedora KDE
The main changes are:
- fixed Steam Overlay coexistence due to Vulkan layer procaddr/trampolining issues
- fixed
dx_apialways showingdx?for DX9/11, also added DX3-7- fixed imgui static library being installed unexpectedly
- vulkan: removed redundant instance dispatch table reload
- vulkan: fixed loader procaddr forwarding
- vulkan: exported Vulkan layer negotiation entrypoint
Source: GitHub
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