check_reboot_required - handle proxmox & rpi specific kernel

files/nrpe/check_reboot_required

@@ -84,19 +84,44 @@ if [ -f /run/reboot-required ]; then
     fi
 fi
 
-# Fallback: compare running kernel with latest installed kernel
+# Fallback: compare running kernel with latest installed kernel package.
+# Tries known naming conventions in order until one matches.
 if [ "$reboot_needed" -eq 0 ]; then
     if ! command -v dpkg >/dev/null 2>&1; then
         echo "UNKNOWN: 'dpkg' not found. Cannot determine reboot status."
         exit $STATE_UNKNOWN
     fi
 
+    installed_kernel=""
+
+    # Standard Debian / Ubuntu: linux-image-<version>
+    if [ -z "$installed_kernel" ]; then
         installed_kernel=$(dpkg -l "linux-image-*" 2>/dev/null \
             | awk '/^ii/{print $2}' \
-        | sed 's/linux-image-//' \
+            | sed 's/^linux-image-//' \
             | grep -E '^[0-9]' \
             | sort -V \
             | tail -1)
+    fi
+
+    # Proxmox: proxmox-kernel-<version>
+    if [ -z "$installed_kernel" ]; then
+        installed_kernel=$(dpkg -l "proxmox-kernel-*" 2>/dev/null \
+            | awk '/^ii/{print $2}' \
+            | sed 's/^proxmox-kernel-//' \
+            | grep -E '^[0-9]' \
+            | sort -V \
+            | tail -1)
+    fi
+
+    # Raspberry Pi: raspberrypi-kernel (version not embedded in the package name;
+    # the primary /run/reboot-required check is the reliable method here).
+    if [ -z "$installed_kernel" ]; then
+        if dpkg -l raspberrypi-kernel 2>/dev/null | grep -q '^ii'; then
+            echo "OK: No reboot required. Running kernel: ${running_kernel}."
+            exit $STATE_OK
+        fi
+    fi
 
     if [ -z "$installed_kernel" ]; then
         echo "UNKNOWN: No versioned kernel package found via dpkg."