memUsedPercMD  = NewGaugeMD(memUsedPerc, "Used memory percentage on the node")
	memFreeMD      = NewGaugeMD(memFree, "Free memory on the node")
	memBuffersMD   = NewGaugeMD(memBuffers, "Buffers memory on the node")
	memCacheMD     = NewGaugeMD(memCache, "Cache memory on the node")
	memSharedMD    = NewGaugeMD(memShared, "Shared memory on the node")
	memAvailableMD = NewGaugeMD(memAvailable, "Available memory on the node")
)

		memUsedPerc:       "Used memory percentage on the node",
		memFree:           "Free memory on the node",
		memShared:         "Shared memory on the node",
		memBuffers:        "Buffers memory on the node",
		memCache:          "Cache memory on the node",
		memAvailable:      "Available memory on the node",
		readsPerSec:       "Reads per second on a drive",
		writesPerSec:      "Writes per second on a drive",

	)

	systemMemoryMG := NewMetricsGroup(systemMemoryCollectorPath,
		[]MetricDescriptor{
			memTotalMD,
			memUsedMD,
			memFreeMD,
			memAvailableMD,
			memBuffersMD,
			memCacheMD,
			memSharedMD,
			memUsedPercMD,
		},
		loadMemoryMetrics,
	)

	systemCPUMG := NewMetricsGroup(systemCPUCollectorPath,
		[]MetricDescriptor{
			sysCPUAvgIdleMD,
			sysCPUAvgIOWaitMD,