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/Command/SsrHealthSampleCommand.php

@@ -57,6 +57,36 @@ final class SsrHealthSampleCommand extends Command
         } catch (\Throwable $e) {
             $row['response_ms'] = (int)round((microtime(true) - $start) * 1000);
         }
+
+        // Cumulative node counters from /__stats (-1 = no data this sample,
+        // e.g. node down or release without the endpoint). The errors tile
+        // computes 24h deltas from these, skipping -1 rows; the counters
+        // reset whenever the node restarts, which the delta logic clamps.
+        $stats = [
+            'stat_hit' => -1, 'stat_miss' => -1, 'stat_stale' => -1,
+            'stat_bypass' => -1, 'stat_render_errors' => -1, 'stat_backend_errors' => -1,
+        ];
+        if ($row['ok'] === 1 && ($statsEndpoint = $this->purgeService->getStatsEndpoint()) !== '') {
+            try {
+                $statsResponse = $this->requestFactory->request($statsEndpoint, 'GET', [
+                    'timeout' => 4, 'connect_timeout' => 2, 'http_errors' => false,
+                ]);
+                if ($statsResponse->getStatusCode() === 200) {
+                    $s = json_decode((string)$statsResponse->getBody(), true) ?: [];
+                    $stats = [
+                        'stat_hit' => (int)($s['hit'] ?? -1),
+                        'stat_miss' => (int)($s['miss'] ?? -1),
+                        'stat_stale' => (int)($s['stale'] ?? -1),
+                        'stat_bypass' => (int)($s['bypass'] ?? -1),
+                        'stat_render_errors' => (int)($s['renderErrors'] ?? -1),
+                        'stat_backend_errors' => (int)($s['backendErrors'] ?? -1),
+                    ];
+                }
+            } catch (\Throwable) {
+                // Stats are optional - the health sample must never fail on them.
+            }
+        }
+        $row = array_merge($row, $stats);
         // Previous samples, newest first, read BEFORE this one is inserted:
         // [0] is the state every transition decision compares against.
         $failoverAfter = $this->purgeService->getFailoverAfter();
@@ -81,6 +111,17 @@ final class SsrHealthSampleCommand extends Command
             $row['cache_mb'],
             $row['response_ms']
         ));
+        if ($row['stat_hit'] >= 0) {
+            $output->writeln(sprintf(
+                'stats: hit=%d miss=%d stale=%d bypass=%d renderErrors=%d backendErrors=%d',
+                $row['stat_hit'],
+                $row['stat_miss'],
+                $row['stat_stale'],
+                $row['stat_bypass'],
+                $row['stat_render_errors'],
+                $row['stat_backend_errors']
+            ));
+        }
         $prevOk = $previous === [] ? null : $previous[0];
         if ($prevOk !== null && $prevOk !== $row['ok']) {
             if ($row['ok'] === 1) {