Update explore-analyze/visualize/charts/metric-charts.md

Co-authored-by: Nastasha Solomon <[email protected]>

Author: florent-leborgne

explore-analyze/visualize/charts/metric-charts.md

@@ -14,7 +14,7 @@ They work with any numeric data: plain numbers, percentages, or calculations lik
 You can also display strings by using the `Last value` aggregation function that picks up the last document, sorted by timestamp, in the current tine frame.
 
 
-To create metric charts in {{kib}}, you must use **Lens**.
+To create metric charts in {{kib}}, you must use [**Lens**](../lens.md)
 
 ![Metric chart representing an SLO with different layouts](../../images/metric-chart.png)