An Azure service that is used to collect, analyze, and act on telemetry data from Azure and on-premises environments.
Pavlova, Lyudmila, Apologies for the delayed response. The user Function is created using the write operation with
"/subscriptions/SUBSCRIPTION_ID/resourceGroups/RESOURCE_GROUP/providers/microsoft.insights/components/APPINSIGHTS_RESOURCE_NAME/analyticsItems/item"
It is documented here - microsoft.insights components/analyticsItems.
Hope this helps.