feat: note if a plugin is no longer being serviced

Dalamud/Interface/Internal/Windows/PluginInstaller/PluginInstallerWindow.cs

@@ -1600,6 +1600,18 @@ internal class PluginInstallerWindow : Window, IDisposable
             ImGui.TextWrapped(Locs.PluginBody_Orphaned);
             ImGui.PopStyleColor();
         }
+        else if (plugin is { IsDecommissioned: true } && !plugin.Manifest.IsThirdParty)
+        {
+            ImGui.PushStyleColor(ImGuiCol.Text, ImGuiColors.DalamudRed);
+            ImGui.TextWrapped(Locs.PluginBody_NoServiceOfficial);
+            ImGui.PopStyleColor();
+        }
+        else if (plugin is { IsDecommissioned: true } && plugin.Manifest.IsThirdParty)
+        {
+            ImGui.PushStyleColor(ImGuiCol.Text, ImGuiColors.DalamudRed);
+            ImGui.TextWrapped(Locs.PluginBody_NoServiceThird);
+            ImGui.PopStyleColor();
+        }
         else if (plugin != null && !plugin.CheckPolicy())
         {
             ImGui.PushStyleColor(ImGuiCol.Text, ImGuiColors.DalamudRed);
@@ -1978,6 +1990,13 @@ internal class PluginInstallerWindow : Window, IDisposable
             trouble = true;
         }
 
+        // Out of service
+        if (plugin.IsDecommissioned)
+        {
+            label += Locs.PluginTitleMod_NoService;
+            trouble = true;
+        }
+
         // Scheduled for deletion
         if (plugin.Manifest.ScheduledForDeletion)
         {
@@ -2875,6 +2894,8 @@ internal class PluginInstallerWindow : Window, IDisposable
 
         public static string PluginTitleMod_Disabled => Loc.Localize("InstallerDisabled", " (disabled)");
 
+        public static string PluginTitleMod_NoService => Loc.Localize("InstallerNoService", " (decommissioned)");
+
         public static string PluginTitleMod_Unloaded => Loc.Localize("InstallerUnloaded", " (unloaded)");
 
         public static string PluginTitleMod_HasUpdate => Loc.Localize("InstallerHasUpdate", " (has update)");
@@ -2943,6 +2964,10 @@ internal class PluginInstallerWindow : Window, IDisposable
 
         public static string PluginBody_Orphaned => Loc.Localize("InstallerOrphanedPluginBody ", "This plugin's source repository is no longer available. You may need to reinstall it from its repository, or re-add the repository.");
 
+        public static string PluginBody_NoServiceOfficial => Loc.Localize("InstallerNoServiceOfficialPluginBody", "This plugin is no longer being maintained. It will still work, but there will be no further updates and you can't reinstall it.");
+
+        public static string PluginBody_NoServiceThird => Loc.Localize("InstallerNoServiceThirdPluginBody", "This plugin is no longer being serviced by its source repo. You may have to look for an updated version in another repo.");
+
         public static string PluginBody_LoadFailed => Loc.Localize("InstallerLoadFailedPluginBody ", "This plugin failed to load. Please contact the author for more information.");
 
         public static string PluginBody_Banned => Loc.Localize("InstallerBannedPluginBody ", "This plugin was automatically disabled due to incompatibilities and is not available at the moment. Please wait for it to be updated by its author.");

Dalamud/Plugin/Internal/Types/LocalPlugin.cs

@@ -220,8 +220,13 @@ internal class LocalPlugin : IDisposable
     /// </summary>
     public bool IsOrphaned => !this.IsDev &&
                               !this.Manifest.InstalledFromUrl.IsNullOrEmpty() && // TODO(api8): Remove this, all plugins will have a proper flag
-                              Service<PluginManager>.Get().Repos.All(x => x.PluginMasterUrl != this.Manifest.InstalledFromUrl) &&
+                              this.GetSourceRepository() == null;
-                              this.Manifest.InstalledFromUrl != LocalPluginManifest.FlagMainRepo;
+
+    /// <summary>
+    /// Gets a value indicating whether or not this plugin is serviced(repo still exists, but plugin no longer does).
+    /// </summary>
+    public bool IsDecommissioned => !this.IsDev &&
+                                    this.GetSourceRepository()?.PluginMaster?.FirstOrDefault(x => x.InternalName == this.Manifest.InternalName) == null;
 
     /// <summary>
     /// Gets a value indicating whether this plugin has been banned.
@@ -638,6 +643,25 @@ internal class LocalPlugin : IDisposable
         }
     }
 
+    /// <summary>
+    /// Get the repository this plugin was installed from.
+    /// </summary>
+    /// <returns>The plugin repository this plugin was installed from, or null if it is no longer there or if the plugin is a dev plugin.</returns>
+    public PluginRepository? GetSourceRepository()
+    {
+        if (this.IsDev)
+            return null;
+
+        var repos = Service<PluginManager>.Get().Repos;
+        return repos.FirstOrDefault(x =>
+        {
+            if (!x.IsThirdParty && !this.Manifest.IsThirdParty)
+                return true;
+
+            return x.PluginMasterUrl == this.Manifest.InstalledFromUrl;
+        });
+    }
+
     private static void SetupLoaderConfig(LoaderConfig config)
     {
         config.IsUnloadable = true;