fix(log-drains): support Axiom edge domains and update Fluent Bit to 5.1

- Add an Axiom edge domain setting (default us-east-1) and use the /v1/ingest endpoint, so EU datasets work
- Remove the Highlight drain (service ended) and stop its running containers
- Update Fluent Bit from 2.0 to 5.1 and use the warn log level
- Restart running drains when the generated files change, with the new image pulled before the old container stops
- Show log drain validation errors under their fields

Closes #9898

database/migrations/2026_10_27_155023_add_logdrain_axiom_domain_to_server_settings_table.php

@@ -0,0 +1,22 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('server_settings', function (Blueprint $table) {
+            $table->string('logdrain_axiom_domain')->nullable()->default('us-east-1.aws.edge.axiom.co');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('server_settings', function (Blueprint $table) {
+            $table->dropColumn('logdrain_axiom_domain');
+        });
+    }
+};

database/migrations/2026_10_27_160258_remove_highlight_log_drain_from_server_settings_table.php

@@ -0,0 +1,43 @@
+<?php
+
+use App\Actions\Server\StopLogDrain;
+use App\Models\Server;
+use App\Models\ServerSetting;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Highlight.io ended its hosted service on 2026-02-28, so its log drain can no longer deliver logs.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        if (! Schema::hasColumn('server_settings', 'is_logdrain_highlight_enabled')) {
+            return;
+        }
+
+        try {
+            $serverIds = ServerSetting::query()->where('is_logdrain_highlight_enabled', true)->pluck('server_id');
+            Server::query()->whereIn('id', $serverIds)->get()
+                ->reject(fn (Server $server) => $server->isTransferredAway())
+                ->each(fn (Server $server) => StopLogDrain::dispatch($server));
+        } catch (Throwable $e) {
+            Log::warning('Could not queue the removal of Highlight log drain containers: '.$e->getMessage());
+        }
+
+        Schema::table('server_settings', function (Blueprint $table) {
+            $table->dropColumn(['is_logdrain_highlight_enabled', 'logdrain_highlight_project_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('server_settings', function (Blueprint $table) {
+            $table->boolean('is_logdrain_highlight_enabled')->default(false);
+            $table->string('logdrain_highlight_project_id')->nullable();
+        });
+    }
+};