Ship production optimization M1-M12.5A: queues, metrics, HTTP observability, and vector search reliability.

Keep similar-ai from tripping the global circuit on a lone URL 502, clamp Qdrant search to 100, and add Server-Timing plus slow-request logging. Studio shared props, Academy S3 exists caching, heat chunking, and Redis/scheduler hygiene stay in this rollout.

config/horizon.php

@@ -99,6 +99,7 @@ return [
     'waits' => [
         'redis:broadcasts' => 15,
         'redis:default' => 60,
+        'redis:mail' => 60,
         'redis:notifications' => 90,
     ],
 
@@ -209,9 +210,9 @@ return [
             'maxJobs' => 0,
             'memory' => 128,
             'tries' => 1,
-            // Long-running recommendation rebuild jobs declare timeouts up to 900s.
-            // Keep the worker timeout above that ceiling so Horizon does not kill
-            // healthy jobs before Laravel can enforce the job-level timeout.
+            // Must stay below config/queue.php redis.retry_after (default 1080).
+            // Nightly recommendation rebuilds are chunked; keep headroom for
+            // remaining long jobs on the default queue.
             'timeout' => 960,
             'nice' => 0,
         ],
@@ -228,6 +229,21 @@ return [
             'timeout' => 90,
             'nice' => 0,
         ],
+        // Mail is intentionally isolated: SMTP latency must not block
+        // search/recommendation workers, and mail jobs declare tries=3–5.
+        'supervisor-mail' => [
+            'connection' => 'redis',
+            'queue' => ['mail'],
+            'balance' => 'simple',
+            'autoScalingStrategy' => 'time',
+            'maxProcesses' => 1,
+            'maxTime' => 0,
+            'maxJobs' => 0,
+            'memory' => 128,
+            'tries' => 5,
+            'timeout' => 90,
+            'nice' => 0,
+        ],
     ],
 
     'environments' => [
@@ -242,6 +258,9 @@ return [
                 'balanceMaxShift' => 1,
                 'balanceCooldown' => 3,
             ],
+            'supervisor-mail' => [
+                'maxProcesses' => 2,
+            ],
         ],
 
         'local' => [
@@ -251,6 +270,9 @@ return [
             'supervisor-messaging' => [
                 'maxProcesses' => 2,
             ],
+            'supervisor-mail' => [
+                'maxProcesses' => 1,
+            ],
         ],
     ],