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fix(docker): calculate Used memory from Total-Free in Docker-in-LXC

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When running Docker inside an LXC container, gopsutil can read the
Total memory (from cgroup limits) and Free memory correctly, but
returns 0 for Used memory. This caused the display to show "0B / 7GB"
even though memory was being used.

Added a fallback that calculates Used = Total - Free when Used is 0
but Total and Free are valid. This completes the fallback chain for
Docker-in-LXC memory reporting.

Fixes #1075
This commit is contained in:
rcourtman
2026-01-12 14:04:38 +00:00
parent b2a6cd0fa3
commit 4090d98160
1 changed files with 14 additions and 0 deletions
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14
internal/monitoring/monitor.go
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@@ -2040,6 +2040,20 @@ func (m *Monitor) ApplyDockerReport(report agentsdocker.Report, tokenRecord *con
memory.Total = report.Host.TotalMemoryBytes
}
// Additional fallback for Docker-in-LXC: gopsutil may read Total and Free
// correctly from cgroup limits but return 0 for Used. Calculate Used from
// Total - Free when this happens. This fixes the "0B / 7GB" display issue.
if memory.Used <= 0 && memory.Total > 0 && memory.Free > 0 {
memory.Used = memory.Total - memory.Free
if memory.Used < 0 {
memory.Used = 0
}
// Recalculate usage percentage
if memory.Total > 0 {
memory.Usage = safePercentage(float64(memory.Used), float64(memory.Total))
}
}
disks := make([]models.Disk, 0, len(report.Host.Disks))
for _, disk := range report.Host.Disks {
disks = append(disks, models.Disk{