Merge pull request #3856 from iss-lab/master

metrics related clarification: 1 minute sliding window

Author: radu-gheorghe

en/operations/metrics.html

@@ -10,6 +10,7 @@
   Metrics for all nodes is aggregated using
   <em><a href="../reference/metrics-v2.html#metrics-v2-values">/metrics/v2/values</a></em> or
   <em><a href="../reference/prometheus-v1.html#prometheus-v1-values">/prometheus/v1/values</a></em>.
+  Values from these endpoints reflect the 1 minute activity immediately before the request.
 </p>
 <p>Example getting a metric value from using the prometheus endpoint:</p>