fix(upgrade): handle status polling after older release restarts

Treat recovered health checks and polling errors as successful completion when older target releases cannot report upgrade status.

AGENTS.md

@@ -30,6 +30,25 @@ docker compose -f docker-compose.yml -f docker-compose.dev.yml down
 
 The app runs at `localhost:8000` by default. Instance **b** is on `8001` (db `5433`, redis `6380`, …); see `./scripts/dev-instances`.
 
+## Testing the Self-Hosted Upgrade Process
+
+Use the following workflow to test a self-hosted upgrade:
+
+1. Install the source version with the upgrade script:
+
+   ```bash
+   bash upgrade.sh sha-6492d081362c009519481ac70e50873e39ba1861
+   ```
+
+2. Set the current Coolify version and rebuild the cached configuration:
+
+   ```bash
+   docker exec -e COOLIFY_VERSION=4.3.0 coolify php artisan config:cache
+   ```
+
+3. In the Coolify UI, click **Check for Updates**.
+4. Confirm that an upgrade is available, then click **Upgrade** and verify that the upgrade completes successfully.
+
 ## Common Commands
 
 ```bash

resources/views/livewire/upgrade.blade.php

@@ -281,11 +281,24 @@
                         return;
                     }
 
-                    const data = await this.$wire.getUpgradeStatus();
+                    let data;
+                    try {
+                        data = await this.$wire.getUpgradeStatus();
+                    } catch (error) {
+                        if (this.instanceWentDown) {
+                            this.showSuccess();
+                            return;
+                        }
+                        throw error;
+                    }
                     if (data.status === 'complete') {
                         this.showSuccess();
                     } else if (data.status === 'error') {
                         this.showError(data.message);
+                    } else if (data.status === 'none' && this.instanceWentDown) {
+                        // Older target releases cannot report the new upgrade status.
+                        // A failed health probe followed by a healthy response proves the restart completed.
+                        this.showSuccess();
                     } else {
                         this.currentStatus = data.message ?? this.getReviveStatusMessage(elapsedMinutes, this.healthCheckAttempts);
                     }

tests/Unit/CoolifyUpgradeStatusTest.php

@@ -139,6 +139,16 @@ it('uses the public health endpoint only for liveness during an upgrade', functi
         ->not->toContain('response.headers.get');
 });
 
+it('finishes after health recovers from observed downtime for older target releases', function () {
+    $upgradeView = file_get_contents(__DIR__.'/../../resources/views/livewire/upgrade.blade.php');
+
+    expect($upgradeView)
+        ->toContain("data.status === 'none' && this.instanceWentDown")
+        ->toContain('if (this.instanceWentDown) {')
+        ->toContain('this.showSuccess();')
+        ->toContain('return;');
+});
+
 it('starts the upgrade after the Livewire response so status polling is not blocked', function () {
     $upgradeComponent = file_get_contents(__DIR__.'/../../app/Livewire/Upgrade.php');