Update keps/sig-node/727-resource-metrics-endpoint/README.md

Co-authored-by: David Ashpole <[email protected]>

Author: richabanker

keps/sig-node/727-resource-metrics-endpoint/README.md

@@ -249,7 +249,7 @@ GA:
 
 ### Upgrade / Downgrade Strategy
 
-
+The kubelet can be upgraded or downgraded normally with respect to this feature. Users of the metrics endpoint, such as the metrics server, should use other kubelet metrics endpoints (such as the summary api) before downgrading.
 
 ### Version Skew Strategy