agent: fix tegrastats VDD_SYS_GPU parsing

- Parse VDD_SYS_GPU <mW>/<mW> correctly

- Add regression test for GPU@ temp + VDD_SYS_GPU power

agent/gpu.go

@@ -168,7 +168,13 @@ func (gm *GPUManager) getJetsonParser() func(output []byte) bool {
 		// Parse power usage
 		powerMatches := powerPattern.FindSubmatch(output)
 		if powerMatches != nil {
-			power, _ := strconv.ParseFloat(string(powerMatches[2]), 64)
+			// powerMatches[2] is the "(GPU_SOC|CPU_GPU_CV) <N>mW" capture
+			// powerMatches[3] is the "VDD_SYS_GPU <N>/<N>" capture
+			powerStr := string(powerMatches[2])
+			if powerStr == "" {
+				powerStr = string(powerMatches[3])
+			}
+			power, _ := strconv.ParseFloat(powerStr, 64)
 			gpuData.Power += power / milliwattsInAWatt
 		}
 		gpuData.Count++

agent/gpu_test.go

@@ -307,6 +307,19 @@ func TestParseJetsonData(t *testing.T) {
 				Count:       1,
 			},
 		},
+		{
+			name:  "orin-style output with GPU@ temp and VDD_SYS_GPU power",
+			input: "RAM 3276/7859MB (lfb 5x4MB) SWAP 1626/12122MB (cached 181MB) CPU [44%@1421,49%@2031,67%@2034,17%@1420,25%@1419,8%@1420] EMC_FREQ 1%@1866 GR3D_FREQ 0%@114 APE 150 MTS fg 1% bg 1% PLL@42.5C MCPU@42.5C PMIC@50C Tboard@38C GPU@39.5C BCPU@42.5C thermal@41.3C Tdiode@39.25C VDD_SYS_GPU 182/182 VDD_SYS_SOC 730/730 VDD_4V0_WIFI 0/0 VDD_IN 5297/5297 VDD_SYS_CPU 1917/1917 VDD_SYS_DDR 1241/1241",
+			wantMetrics: &system.GPUData{
+				Name:        "GPU",
+				MemoryUsed:  3276.0,
+				MemoryTotal: 7859.0,
+				Usage:       0.0,
+				Power:       0.182, // 182mW -> 0.182W
+				Temperature: 39.5,
+				Count:       1,
+			},
+		},
 	}
 
 	for _, tt := range tests {