Explanation:
Box 1: 14 days
Two weeks will be covered.
Note: Startofweek returns the start of the week containing the date, shifted by an offset, if provided.
Start of the week is considered to be a Sunday.
Endofweek returns the end of the week containing the date, shifted by an offset, if provided.
Last day of the week is considered to be a Saturday.
Box 2:
The render operator renders results in as graphical output. Timechart is a Line graph, where the first column is x-axis, and should be datetime. Other columns are y-axes. In this case the Y axis has avg (CounterValue) Values.
Reference:
https://docs.microsoft.com/en-us/azure/azure-monitor/log-query/log-query-overview
https://docs-analytics-
eus.azurewebsites.net/queryLanguage/query_language_renderoperator.html