Add gopsutil meminfo fields to mem plugin (#4546)

plugins/inputs/mem/memory_test.go

@@ -27,6 +27,27 @@ func TestMemStats(t *testing.T) {
 		// Buffers:     771,
 		// Cached:      4312,
 		// Shared:      2142,
+		CommitLimit:    1,
+		CommittedAS:    118680,
+		Dirty:          4,
+		HighFree:       0,
+		HighTotal:      0,
+		HugePageSize:   4096,
+		HugePagesFree:  0,
+		HugePagesTotal: 0,
+		LowFree:        69936,
+		LowTotal:       255908,
+		Mapped:         42236,
+		PageTables:     1236,
+		Shared:         0,
+		SwapCached:     0,
+		SwapFree:       524280,
+		SwapTotal:      524280,
+		VMallocChunk:   3872908,
+		VMallocTotal:   3874808,
+		VMallocUsed:    1416,
+		Writeback:      0,
+		WritebackTmp:   0,
 	}
 
 	mps.On("VMStat").Return(vms, nil)
@@ -47,6 +68,27 @@ func TestMemStats(t *testing.T) {
 		"inactive":          uint64(1124),
 		"wired":             uint64(134),
 		"slab":              uint64(1234),
+		"commit_limit":      uint64(1),
+		"committed_as":      uint64(118680),
+		"dirty":             uint64(4),
+		"high_free":         uint64(0),
+		"high_total":        uint64(0),
+		"huge_page_size":    uint64(4096),
+		"huge_pages_free":   uint64(0),
+		"huge_pages_total":  uint64(0),
+		"low_free":          uint64(69936),
+		"low_total":         uint64(255908),
+		"mapped":            uint64(42236),
+		"page_tables":       uint64(1236),
+		"shared":            uint64(0),
+		"swap_cached":       uint64(0),
+		"swap_free":         uint64(524280),
+		"swap_total":        uint64(524280),
+		"vmalloc_chunk":     uint64(3872908),
+		"vmalloc_total":     uint64(3874808),
+		"vmalloc_used":      uint64(1416),
+		"write_back":        uint64(0),
+		"write_back_tmp":    uint64(0),
 	}
 	acc.AssertContainsTaggedFields(t, "mem", memfields, make(map[string]string))