SSR dashboard: new errors-and-hit-rate tile fed by /__stats samples in vitec:ssr-health (stat_* columns in healthlog)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/vitec/Classes/Service/SsrPurgeService.php

@@ -42,6 +42,21 @@ final class SsrPurgeService
         return $this->getConfig()['SSR_HEALTH_ENDPOINT'] ?? '';
     }
 
+    /**
+     * The /__stats sibling of the health endpoint (cumulative hit/miss/
+     * error counters, in the node since release 20261109-211544). Derived
+     * from SSR_HEALTH_ENDPOINT; SSR_STATS_ENDPOINT overrides explicitly.
+     */
+    public function getStatsEndpoint(): string
+    {
+        $explicit = $this->getConfig()['SSR_STATS_ENDPOINT'] ?? '';
+        if ($explicit !== '') {
+            return $explicit;
+        }
+        $health = $this->getHealthEndpoint();
+        return $health === '' ? '' : str_replace('/__health', '/__stats', $health);
+    }
+
     /**
      * Comma-separated recipient list for vitec:ssr-health transition and
      * failover alerts (SSR_ALERT_EMAIL); empty string = alerting off.