feat: new input Hugepages plugin

plugins/inputs/hugepages/README.md

@@ -40,17 +40,18 @@ Consult <https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html>
     - free (integer)
     - surplus (integer)
     - total (integer)
-- hugepages_meminfo (gathered from `/proc/meminfo` file)
+- hugepages_meminfo (gathered from `/proc/meminfo` file) 
+  - The fields `total`, `free`, `reserved`, and `surplus` are counts of pages of default size. Fields with suffix `_kb` are in kilobytes.
   - fields:
     - anonymous_kb (integer, kB)
-    - default_size_kb (integer, kB)
     - file_kb (integer, kB)
-    - free_of_default_size (integer)
-    - reserved_of_default_size (integer)
-    - shared_memory_kb (integer, kB)
-    - surplus_of_default_size (integer)
-    - total_consumed_by_all_sizes_kb (integer, kB)
-    - total_of_default_size (integer)
+    - free (integer)
+    - reserved (integer)
+    - shared_kb (integer, kB)
+    - size_kb (integer, kB)
+    - surplus (integer)
+    - tlb_kb (integer, kB)
+    - total (integer)
 
 ## Example Output
 
@@ -62,5 +63,5 @@ $ ./telegraf -config telegraf.conf -input-filter hugepages -test
 > hugepages_per_node,host=ubuntu,size_kb=2048,node=0 free=434i,surplus=0i,total=1024i 1646258020000000000
 > hugepages_per_node,host=ubuntu,size_kb=1048576,node=1 free=0i,surplus=0i,total=4i 1646258020000000000
 > hugepages_per_node,host=ubuntu,size_kb=2048,node=1 free=449i,surplus=0i,total=1024i 1646258020000000000
-> hugepages_meminfo,host=ubuntu anonymous_kb=0i,default_size_kb=2048i,file_kb=0i,free_of_default_size=883i,reserved_of_default_size=0i,shared_memory_kb=0i,surplus_of_default_size=0i,total_consumed_by_all_sizes_kb=12582912i,total_of_default_size=2048i 1646258020000000000
+> hugepages_meminfo,host=ubuntu anonymous_kb=0i,file_kb=0i,free=883i,reserved=0i,shared_kb=0i,size_kb=2048i,surplus=0i,tlb_kb=12582912i,total=2048i 1646258020000000000
 ```

plugins/inputs/hugepages/hugepages.go

@@ -56,14 +56,14 @@ var (
 	}
 
 	hugepagesMetricsFromMeminfo = map[string]string{
-		"HugePages_Total": "total_of_default_size",
-		"HugePages_Free":  "free_of_default_size",
-		"HugePages_Rsvd":  "reserved_of_default_size",
-		"HugePages_Surp":  "surplus_of_default_size",
-		"Hugepagesize":    "default_size_kb",
-		"Hugetlb":         "total_consumed_by_all_sizes_kb",
+		"HugePages_Total": "total",
+		"HugePages_Free":  "free",
+		"HugePages_Rsvd":  "reserved",
+		"HugePages_Surp":  "surplus",
+		"Hugepagesize":    "size_kb",
+		"Hugetlb":         "tlb_kb",
 		"AnonHugePages":   "anonymous_kb",
-		"ShmemHugePages":  "shared_memory_kb",
+		"ShmemHugePages":  "shared_kb",
 		"FileHugePages":   "file_kb",
 	}
 )

plugins/inputs/hugepages/hugepages_test.go

@@ -131,15 +131,15 @@ func TestGather(t *testing.T) {
 		require.NoError(t, h.Gather(acc))
 
 		expectedFields := map[string]interface{}{
-			"anonymous_kb":                   0,
-			"shared_memory_kb":               0,
-			"file_kb":                        0,
-			"total_of_default_size":          2048,
-			"free_of_default_size":           883,
-			"reserved_of_default_size":       0,
-			"surplus_of_default_size":        0,
-			"default_size_kb":                2048,
-			"total_consumed_by_all_sizes_kb": 12582912,
+			"anonymous_kb": 0,
+			"shared_kb":    0,
+			"file_kb":      0,
+			"total":        2048,
+			"free":         883,
+			"reserved":     0,
+			"surplus":      0,
+			"size_kb":      2048,
+			"tlb_kb":       12582912,
 		}
 		acc.AssertContainsFields(t, "hugepages_meminfo", expectedFields)
 	})