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collector/netdev_linux.go: Fallback to 32-bit stats (#2757)

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On some platforms, `msg.Attributes.Stats64` is `nil` because the kernel doesn't
expose 64-bit stats. In that case, return `msg.Attributes.Stats` instead, which
are the 32-bit equivalent.

Note that `RXOtherhostDropped` isn't available in that case, so we hardcode it
to zero.

Fixes #2756.

Signed-off-by: Benoît Knecht <bknecht@protonmail.ch>
This commit is contained in:
Benoît Knecht 2023-08-01 15:58:53 +02:00 committed by GitHub
parent 5d1b96c936
commit 3b9613cfae
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39
collector/netdev_linux.go
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@ -56,14 +56,53 @@ func parseNetlinkStats(links []rtnetlink.LinkMessage, filter *deviceFilter, logg
metrics := netDevStats{}
for _, msg := range links {
if msg.Attributes == nil {
level.Debug(logger).Log("msg", "No netlink attributes, skipping")
continue
}
name := msg.Attributes.Name
stats := msg.Attributes.Stats64
if stats32 := msg.Attributes.Stats; stats == nil && stats32 != nil {
stats = &rtnetlink.LinkStats64{
RXPackets: uint64(stats32.RXPackets),
TXPackets: uint64(stats32.TXPackets),
RXBytes: uint64(stats32.RXBytes),
TXBytes: uint64(stats32.TXBytes),
RXErrors: uint64(stats32.RXErrors),
TXErrors: uint64(stats32.TXErrors),
RXDropped: uint64(stats32.RXDropped),
TXDropped: uint64(stats32.TXDropped),
Multicast: uint64(stats32.Multicast),
Collisions: uint64(stats32.Collisions),
RXLengthErrors: uint64(stats32.RXLengthErrors),
RXOverErrors: uint64(stats32.RXOverErrors),
RXCRCErrors: uint64(stats32.RXCRCErrors),
RXFrameErrors: uint64(stats32.RXFrameErrors),
RXFIFOErrors: uint64(stats32.RXFIFOErrors),
RXMissedErrors: uint64(stats32.RXMissedErrors),
TXAbortedErrors: uint64(stats32.TXAbortedErrors),
TXCarrierErrors: uint64(stats32.TXCarrierErrors),
TXFIFOErrors: uint64(stats32.TXFIFOErrors),
TXHeartbeatErrors: uint64(stats32.TXHeartbeatErrors),
TXWindowErrors: uint64(stats32.TXWindowErrors),
RXCompressed: uint64(stats32.RXCompressed),
TXCompressed: uint64(stats32.TXCompressed),
RXNoHandler: uint64(stats32.RXNoHandler),
RXOtherhostDropped: 0,
}
}
if filter.ignored(name) {
level.Debug(logger).Log("msg", "Ignoring device", "device", name)
continue
}
// Make sure we don't panic when accessing `stats` attributes below.
if stats == nil {
level.Debug(logger).Log("msg", "No netlink stats, skipping")
continue
}
// https://github.com/torvalds/linux/blob/master/include/uapi/linux/if_link.h#L42-L246
metrics[name] = map[string]uint64{
"receive_packets": stats.RXPackets,