Understand traffic percent setting in Azure Function deployment slot

Question

I am trying to understand Azure Function deployment slot concept

1. What does the traffic % column represent? Even when my staging slot traffic % is set to 0, it's still getting triggered.

2. How does the scaling of nodes work for staging slot?

Answer 1

What does the traffic % column represent?

The Traffic % column in the Function App deployment slots refers to the percentage of traffic that is routed to that particular slot.

1. By default, Traffic % is set to 0 for the newly created slot, which means all the traffic is routed to the production slot and no traffic will be routed to the non-production/staging slot.
2. If you set Traffic setting as 20% for non-production slot, the specified % of clients will be routed to the non-production slot and the remaining 80% will be handled by the production slot.

The staging slot(<app-name/slot-name>) can be seen as a separate app with the same designation which works just like any other Function app. Slot's configuration can be changed according to the requirement.

Even when my staging slot traffic % is set to 0, it's still getting triggered.

1. Check the configuration of function app to make sure that all functions are referring to particular slot.
2. Try creating a new deployment slot and check if the issue persists.

How does the scaling of nodes work for staging slot?

• The number of instances for the staging slot/non-production slot can be scaled independently.
• When you scale the number of instances for the staging slot, it will only affect the instances in that slot and production slot instances won't be affected. This helps to test the application with different scaling configurations.

References:

Azure Functions deployment slots