Merge pull request #219179 from flang-msft/fxl---Provide-recommendations-for-which-metrics-to-use-for-clustered-caches-14977378

fxl---added text from work item 14977378

Author: prmerger-automator[bot]

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

@@ -125,6 +125,10 @@ The types **Count** and **“Sum** can be misleading for certain metrics (connec
 > Even when the cache is idle with no connected active client applications, you might see some cache activity, such as connected clients, memory usage, and operations being performed. The activity is normal in the operation of cache.
 >
 
+For non-clustered caches, we recommend using the metrics without the suffix `Instance Based`. For example, to check server load for your cache instance, use the metric `Server Load`.
+
+In contrast, for clustered caches, we recommend using the metrics with the suffix `Instance Based`, Then, add a split or filter on `ShardId`. For example, to check the server load of shard 1, use the metric "Server Load (Instance Based)", then apply filter `ShardId = 1`.
+
 ## List of metrics
 
 - Cache Latency (preview)