I'm trying to investigate the performance of a Vulkan application I'm developing on Linux. I'm running kernel 5.6.14, Mesa 19.3.3, Vulkan SDK 1.2.131, and vulkaninfo confirms the availability of the VK_INTEL_performance_query device extension. I've installed version 20.1.1585397060 of the analyzers. My distro is NixOS, so I had to get a bit creative to get the analyzers working, but the system analyzer does successfully chart various CPU and GPU performance counters.
Graphics Monitor displays "Supported APIs: OpenGL" and doesn't seem to be able to interact with my application; no overlay is displayed and attempts to capture a frame have no effect. How does Graphics Monitor determine Vulkan API support? Is there something I might have missed in adapting it to NixOS?