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Fix Docker CPU calculation on systemUsage counter reset

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When systemUsage counter goes backward (common in unprivileged LXC
containers), the previous code used the absolute value as systemDelta.
This created an artificially small denominator, inflating CPU to ~100%.

Now leaves systemDelta as 0 on counter reset, falling through to the
time-based calculation which produces accurate results.

Related to #770
This commit is contained in:
rcourtman
2025-11-28 15:07:49 +00:00
parent d93e17e898
commit 806cdd2d87
1 changed files with 2 additions and 2 deletions
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internal/dockeragent/agent.go
+2 -2
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@@ -1377,9 +1377,9 @@ func (a *Agent) calculateContainerCPUPercent(id string, stats containertypes.Sta
var systemDelta float64
if current.systemUsage >= prev.systemUsage {
systemDelta = float64(current.systemUsage - prev.systemUsage)
} else if current.systemUsage > 0 {
systemDelta = float64(current.systemUsage)
}
// If systemUsage went backward (counter reset), leave systemDelta as 0
// to fall through to time-based calculation below
if systemDelta > 0 {
cpuPercent := safeFloat((totalDelta / systemDelta) * float64(onlineCPUs) * 100.0)