@Sudesh Sharma - Thank you for reaching out with your query.
Currently I see that you need to have the Insights enabled for a given virtual machine to get the metrics needed for memory. You can review the out of box capacity utilization charts or run query from the perf logs and pin that to Azure dashboard
Please be aware on the current limitations regarding performance collection with VM insights.
Hope this information helps, please circle back if you have any further queries. Thanks