I have turned on Application Insights in my Web App, but when i go to live metrics in Application Insights I get the above error "Not available: your app is offline or using an older SDK' .
What do i need to turn on in Azure ? Any help or guidance would be appreciated
You may try it by using the latest application insights packages, or downgrade it. If it's not working, you'd better submit a support ticket.
As a workaround, you can use Logs feature or Search feature in application insights in azure portal. From there, you can also see these logs.