memory graphs: Fix 'RAM' for linux

CMK-20592

Change-Id: I41cd7d247c89e550669cfe7fad9bf0e3b44536ba

Author: si-23

cmk/base/legacy_checks/mem_linux.py

@@ -39,6 +39,7 @@ def check_mem_linux(_no_item, params, section):
         + section.get("SReclaimable", 0)
     )
 
+    # RAM, https://github.com/Checkmk/checkmk/commit/1657414506bfe8f4001f3e10ef648947276ad75d
     section["MemUsed"] = section["MemTotal"] - section["MemFree"] - section["Caches"]
     section["SwapUsed"] = section["SwapTotal"] - section["SwapFree"]
     section["TotalTotal"] = section["MemTotal"] + section["SwapTotal"]

cmk/plugins/memory/graphing/mem.py

@@ -59,7 +59,7 @@
     name="swap_cached",
     title=Title("Swap cached"),
     unit=UNIT_BYTES,
-    color=Color.LIGHT_GREEN,
+    color=Color.PINK,
 )
 metric_mem_lnx_slab = Metric(
     name="mem_lnx_slab",
@@ -79,6 +79,12 @@
     unit=UNIT_BYTES,
     color=Color.CYAN,
 )
+metric_sreclaimable = Metric(
+    name="sreclaimable",
+    title=Title("Reclaimable slab"),
+    unit=UNIT_BYTES,
+    color=Color.ORANGE,
+)
 
 perfometer_mem_used = Perfometer(
     name="mem_used",
@@ -151,6 +157,37 @@
         "mem_used",
         "mem_free",
     ),
+    conflicting=("mem_lnx_cached", "mem_lnx_buffers"),
+)
+graph_mem_absolute_2 = Graph(
+    name="mem_absolute_2",
+    title=Title("RAM"),
+    simple_lines=(
+        # see mem_linux.py
+        Sum(
+            Title("Total RAM"),
+            Color.DARK_BLUE,
+            (
+                "mem_used",
+                "mem_free",
+                "mem_lnx_cached",
+                "mem_lnx_buffers",
+                "swap_cached",
+                "sreclaimable",
+            ),
+        ),
+        WarningOf("mem_used"),
+        CriticalOf("mem_used"),
+    ),
+    compound_lines=(
+        "mem_used",
+        "mem_free",
+        "mem_lnx_cached",
+        "mem_lnx_buffers",
+        "swap_cached",
+        "sreclaimable",
+    ),
+    optional=("swap_cached", "sreclaimable"),
 )
 graph_ram_swap_used = Graph(
     name="ram_swap_used",

cmk/plugins/memory/graphing/standalone.py

@@ -20,12 +20,6 @@
     unit=UNIT_BYTES,
     color=Color.PURPLE,
 )
-metric_sreclaimable = Metric(
-    name="sreclaimable",
-    title=Title("Reclaimable slab"),
-    unit=UNIT_BYTES,
-    color=Color.PURPLE,
-)
 metric_sunreclaim = Metric(
     name="sunreclaim",
     title=Title("Unreclaimable slab"),