memory and swap

modules/memory.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+name='Memory'
+available=1
+recommend=1
+
+THRESHOLD=90
+
+check() {
+    mem_total=$(awk '/^MemTotal:/ {print $2}' /proc/meminfo)
+    mem_avail=$(awk '/^MemAvailable:/ {print $2}' /proc/meminfo)
+    mem_used_pct=$(
+        awk -v t="$mem_total" -v a="$mem_avail" '
+            BEGIN {
+                if (t > 0) {
+                    used = t - a;
+                    pct = (used * 100) / t;
+                    printf "%d", pct;
+                }
+            }
+        '
+    )
+
+    if [ "$mem_used_pct" -ge "$THRESHOLD" ] 2>/dev/null; then
+        warn "memory" "$mem_used_pct" "Memory usage is at ${mem_used_pct}%"
+    else
+        ok "memory" "$mem_used_pct" "Memory usage is at ${mem_used_pct}%"
+    fi
+}

modules/swap.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+name='Swap'
+available=1
+recommend=0
+
+THRESHOLD=90
+
+
+swap_total=$(awk '/^SwapTotal:/ {print $2}' /proc/meminfo)
+
+if [ "${swap_total:-0}" -eq 0 ] 2>/dev/null; then
+    available=0
+fi
+
+check() {
+    swap_free=$(awk '/^SwapFree:/ {print $2}' /proc/meminfo)
+
+    swap_used_pct=$(
+        awk -v t="$swap_total" -v f="$swap_free" '
+            BEGIN {
+                if (t > 0) {
+                    used = t - f;
+                    pct = (used * 100) / t;
+                    printf "%d", pct;
+                }
+            }
+        '
+    )
+
+    if [ "$swap_used_pct" -ge "$THRESHOLD" ] 2>/dev/null; then
+        warn "swap" "$swap_used_pct" "Swap usage is at ${swap_used_pct}%"
+    else
+        ok "swap" "$swap_used_pct" "Swap usage is at ${swap_used_pct}%"
+    fi
+}