Reduce log spam when unable to get network stats

Author: derekwaynecarr

container/libcontainer/helpers.go

@@ -99,37 +99,37 @@ func GetStats(cgroupManager cgroups.Manager, rootFs string, pid int, ignoreMetri
 	if !ignoreMetrics.Has(container.NetworkUsageMetrics) {
 		netStats, err := networkStatsFromProc(rootFs, pid)
 		if err != nil {
-			glog.V(2).Infof("Unable to get network stats from pid %d: %v", pid, err)
+			glog.V(4).Infof("Unable to get network stats from pid %d: %v", pid, err)
 		} else {
 			stats.Network.Interfaces = append(stats.Network.Interfaces, netStats...)
 		}
 	}
 	if !ignoreMetrics.Has(container.NetworkTcpUsageMetrics) {
 		t, err := tcpStatsFromProc(rootFs, pid, "net/tcp")
 		if err != nil {
-			glog.V(2).Infof("Unable to get tcp stats from pid %d: %v", pid, err)
+			glog.V(4).Infof("Unable to get tcp stats from pid %d: %v", pid, err)
 		} else {
 			stats.Network.Tcp = t
 		}
 
 		t6, err := tcpStatsFromProc(rootFs, pid, "net/tcp6")
 		if err != nil {
-			glog.V(2).Infof("Unable to get tcp6 stats from pid %d: %v", pid, err)
+			glog.V(4).Infof("Unable to get tcp6 stats from pid %d: %v", pid, err)
 		} else {
 			stats.Network.Tcp6 = t6
 		}
 	}
 	if !ignoreMetrics.Has(container.NetworkUdpUsageMetrics) {
 		u, err := udpStatsFromProc(rootFs, pid, "net/udp")
 		if err != nil {
-			glog.V(2).Infof("Unable to get udp stats from pid %d: %v", pid, err)
+			glog.V(4).Infof("Unable to get udp stats from pid %d: %v", pid, err)
 		} else {
 			stats.Network.Udp = u
 		}
 
 		u6, err := udpStatsFromProc(rootFs, pid, "net/udp6")
 		if err != nil {
-			glog.V(2).Infof("Unable to get udp6 stats from pid %d: %v", pid, err)
+			glog.V(4).Infof("Unable to get udp6 stats from pid %d: %v", pid, err)
 		} else {
 			stats.Network.Udp6 = u6
 		}