Merge pull request #267290 from flang-msft/fxl---Update-cache-how-to-monitor.md-119797

Fxl   update cache how to monitor.md 119797

Author: prmerger-automator[bot]

articles/azure-cache-for-redis/cache-how-to-monitor.md

@@ -167,6 +167,9 @@ In contrast, for clustered caches, we recommend using the metrics with the suffi
     - **Export** – when there's an issue related to Export RDB
     - **AADAuthenticationFailure** (preview) - when there's an authentication failure using Microsoft Entra access token
     - **AADTokenExpired** (preview) - when a Microsoft Entra access token used for authentication isn't renewed and it expires.
+> [!NOTE]
+> Metrics for errors aren't available when using the Enterprise Tiers.
+
 - Evicted Keys
   - The number of items evicted from the cache during the specified reporting interval because of the `maxmemory` limit.
   - This number maps to `evicted_keys` from the Redis INFO command.