feat(waybar): show degraded systemd units

dots/.config/waybar/config

@@ -20,6 +20,7 @@
         ],
         "modules-right": [
             "custom/pacman-update",
+            "systemd-failed-units",
             "tray",
             "backlight",
             "network",
@@ -106,7 +107,8 @@
         },
         "backlight": {
             "format": "󰃠 {percent}%",
-            "scroll-step": 5.0
+            "scroll-step": 5.0,
+            "device": "intel_backlight"
         },
         "network": {
             "on-click-right": "~/.config/waybar/scripts/set-rfkill.bash",
@@ -225,6 +227,11 @@
                 "firefoxdeveloperedition": "firefox-developer-edition"
             }
         },
+        "systemd-failed-units": {
+            "format": "✗ Degraded Units: {nr_failed}",
+            "system": true,
+            "user": true
+        },
         "tray": {
             "icon-size": 14
         }

dots/.config/waybar/style.css

@@ -72,6 +72,7 @@ tooltip label,
 #taskbar,
 #tray,
 #backlight,
+#systemd-failed-units,
 #tray menu,
 #custom-lock {
   background-color: #16161d;
@@ -268,6 +269,15 @@ tooltip {
   color: #7e9cd8;
 }
 
+#systemd-failed-units.ok {
+  color: #98BB6C;
+}
+
+#systemd-failed-units.degraded {
+  color: #FF5D62;
+  font-weight: bolder;
+}
+
 /* Tray */
 #tray {
   -gtk-icon-shadow: 0 0 2px #957fb8;