Investigate and Implement Istio Based Canary Deployments

[dthomson25]

Currently, Canary deployments are limited to traffic shaping using the round-robin behavior of the Kubernetes Service. This strategy works with applications with at least 10 replicas running because they can limit the scope of their change to a smaller percentage of the traffic. However, smaller applications cannot limit the percentage to the same degree. With a service mesh solution, the small applications achieve the same percentages as the larger applications.

This issue will be updated after an initial investigation to determine the work required to add an Istio based canary deployment.

[dthomson25]

Remaining work for this ticket includes:

• Enqueue rollout on any virtual service change
• Validation of the virtual services

[dthomson25]

The Alpha version has been merged in.