diff --git a/backend/src/query-api/service-metrics/metrics-cache.service.ts b/backend/src/query-api/service-metrics/metrics-cache.service.ts
index 5e125a1..bb89582 100644
--- a/backend/src/query-api/service-metrics/metrics-cache.service.ts
+++ b/backend/src/query-api/service-metrics/metrics-cache.service.ts
@@ -42,6 +42,10 @@ export class MetricsCacheService implements OnModuleInit, OnModuleDestroy {
     const tls = useTls
       ? {
           rejectUnauthorized: process.env.REDIS_REJECT_UNAUTHORIZED !== "false",
+          checkServerIdentity:
+            process.env.REDIS_CHECK_SERVER_IDENTITY === "false"
+              ? () => undefined
+              : undefined,
         }
       : undefined;
 
diff --git a/backend/src/query-api/service-metrics/service-metrics.service.ts b/backend/src/query-api/service-metrics/service-metrics.service.ts
index 6f78a0a..567a8e2 100644
--- a/backend/src/query-api/service-metrics/service-metrics.service.ts
+++ b/backend/src/query-api/service-metrics/service-metrics.service.ts
@@ -250,12 +250,19 @@ export class ServiceMetricsService {
 
     const cacheKey =
       this.rollupCacheAvailable() &&
+      window.isSlidingWindow &&
       this.buildRollupCacheKey(normalized, window);
     if (cacheKey) {
       const cached = await this.metricsCache.get(cacheKey);
       if (cached) {
+        this.logger.debug(
+          `롤업 캐시 히트 service=${normalized.serviceName} window=${this.formatTimestamp(window.from)}~${this.formatTimestamp(window.to)}`,
+        );
         return JSON.parse(cached) as ServiceMetricBucket[];
       }
+      this.logger.debug(
+        `롤업 캐시 미스 service=${normalized.serviceName} window=${this.formatTimestamp(window.from)}~${this.formatTimestamp(window.to)}`,
+      );
     }
 
     const fromMs = Date.parse(window.from);
@@ -328,7 +335,11 @@ export class ServiceMetricsService {
     if (!this.rollupEnabled) {
       return {
         rollupWindow: null,
-        rawWindow: { from: normalized.from, to: normalized.to },
+        rawWindow: {
+          from: normalized.from,
+          to: normalized.to,
+          isSlidingWindow: normalized.isSlidingWindow,
+        },
       };
     }
 
@@ -337,14 +348,22 @@ export class ServiceMetricsService {
     if (!Number.isFinite(fromMs) || !Number.isFinite(toMs) || toMs <= fromMs) {
       return {
         rollupWindow: null,
-        rawWindow: { from: normalized.from, to: normalized.to },
+        rawWindow: {
+          from: normalized.from,
+          to: normalized.to,
+          isSlidingWindow: normalized.isSlidingWindow,
+        },
       };
     }
 
     if (toMs - fromMs <= this.rollupThresholdMs) {
       return {
         rollupWindow: null,
-        rawWindow: { from: normalized.from, to: normalized.to },
+        rawWindow: {
+          from: normalized.from,
+          to: normalized.to,
+          isSlidingWindow: normalized.isSlidingWindow,
+        },
       };
     }
 
@@ -353,18 +372,24 @@ export class ServiceMetricsService {
     if (splitPoint <= fromMs) {
       return {
         rollupWindow: null,
-        rawWindow: { from: normalized.from, to: normalized.to },
+        rawWindow: {
+          from: normalized.from,
+          to: normalized.to,
+          isSlidingWindow: normalized.isSlidingWindow,
+        },
       };
     }
 
     const rollupWindow: MetricsWindow = {
       from: normalized.from,
       to: new Date(splitPoint).toISOString(),
+      isSlidingWindow: normalized.isSlidingWindow,
     };
 
     const rawWindow: MetricsWindow = {
       from: rollupWindow.to,
       to: normalized.to,
+      isSlidingWindow: normalized.isSlidingWindow,
     };
     return {
       rollupWindow,
@@ -470,6 +495,7 @@ export class ServiceMetricsService {
 interface MetricsWindow {
   from: string;
   to: string;
+  isSlidingWindow: boolean;
 }
 
 interface MetricsFetchPlan {
diff --git a/backend/src/stream-processor/common/bulk-indexer.service.ts b/backend/src/stream-processor/common/bulk-indexer.service.ts
index 1bf658a..7df3c9b 100644
--- a/backend/src/stream-processor/common/bulk-indexer.service.ts
+++ b/backend/src/stream-processor/common/bulk-indexer.service.ts
@@ -24,6 +24,7 @@ export class BulkIndexerService implements OnModuleDestroy {
   private readonly maxBatchSize: number;
   private readonly maxBatchBytes: number;
   private readonly flushIntervalMs: number;
+  // 병렬 플러시
   private readonly maxParallelFlushes: number;
 
   private buffer: BufferedItem[] = [];
@@ -48,7 +49,7 @@ export class BulkIndexerService implements OnModuleDestroy {
     );
     this.maxParallelFlushes = Math.max(
       1,
-      Number.parseInt(process.env.BULK_MAX_PARALLEL_FLUSHES ?? "2", 10),
+      Number.parseInt(process.env.BULK_MAX_PARALLEL_FLUSHES ?? "3", 10),
     );
   }