Add a new field `.spec.webhooks[].retries` to specify the number of
retries when calling a webhook.
Signed-off-by: Joseph Kwasniewski <kwasniewski@gmail.com>
Adding support for overriding the primary scaler replica count via
.spec.autoscalerRef.primaryScalerReplicas, a feature which would enable
users to define a different scaling configurations for the primary.
This can be useful in the situation where the user does not want to
scale the canary workload to the exact same size as the primary,
especially when opting for a canary deployment pattern where only a
small portion of traffic is routed to the canary workload pods.
Signed-off-by: Aurel Canciu <aurelcanciu@gmail.com>
Router implementation for zalan.do/Skipper Ingress -
An HTTP router and reverse proxy for service composition, including use cases like Kubernetes Ingress
https://github.com/zalando/skipper/
* The concept is to define routes with specific weights via the skipper specific annotation predicate of "zalando.org/backend-weights".
* A new "canary ingress" is created that has higher "weight" thus receiving all traffic, which distributes progressively
* After the canary process is finished, this ingress is disabled via the "False()" annotation predicate to route traffic again back to the apex Ingress.
There are certain Skipper principles which are taken into account:
```
Skipper Principles:
* if only one backend has a weight, only one backend will get 100% traffic
* if two of three or more backends have a weight, only those two should get traffic.
* if two backends don't have any weight, it's undefined and right now they get equal amount of traffic.
* weights can be int or float, but always treated as a ratio.
Implementation:
* apex Ingress is immutable
* new canary Ingress contains two paths for primary and canary service
* canary Ingress manages weights on primary & canary service, hence no traffic to apex service
```
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add kubectl annotation
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