From f946b73f1693cd966bc0de3fa3fc682eb116f6cb Mon Sep 17 00:00:00 2001
From: Gabe Kangas <gabek@real-ity.com>
Date: Fri, 9 Dec 2022 09:49:17 -0800
Subject: [PATCH] Fix CPU usage collection panic with default zero value.
 Closes #2423

---
 metrics/hardware.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/metrics/hardware.go b/metrics/hardware.go
index 595944006..9a642fa73 100644
--- a/metrics/hardware.go
+++ b/metrics/hardware.go
@@ -24,7 +24,14 @@ func collectCPUUtilization() {
 		return
 	}
 
-	metricValue := TimestampedValue{time.Now(), v[0]}
+	// Default to zero but try to use the cumulative values of all the CPUs
+	// if values exist.
+	value := 0.0
+	if len(v) > 0 {
+		value = v[0]
+	}
+
+	metricValue := TimestampedValue{time.Now(), value}
 	metrics.CPUUtilizations = append(metrics.CPUUtilizations, metricValue)
 	cpuUsage.Set(metricValue.Value)
 }