Serving updates and istio doc (simple mode)

[muscionig]

Changes

This PR mainly adds documentation for developing with istio and updates all versions of serving to the latest (v1.16.0).

(Please let me know if anything in this PR is not following guidelines, I reviewed them on the serving repo but it is possible I have missed something. Happy to make edits if required.)

Minor Changes

• 🎁 updates serving (and respective networking layers) to v1.16.0.
• 🎁 adding istio to development guidelines, please see below for report on testing as DEVELOPMENT.md contains examples only using kourier. While this contributes to Document support with Istio and MTLS #56, additional testing is required to enable injection.
• 🐛 change pullPolicy so that ko.local can be used under Minikube (happy to revert if this is not preferred).
• 🧹 updated documentation listing istio and clean up usage guide.

istio:

before scaling:

$ kubectl get pod -A   
NAMESPACE         NAME                                                     READY   STATUS    RESTARTS      AGE
cert-manager      cert-manager-67c98b89c8-2qvqt                            1/1     Running   0             37m
cert-manager      cert-manager-cainjector-5c5695d979-wbhth                 1/1     Running   0             37m
cert-manager      cert-manager-webhook-7f9f8648b9-22wf5                    1/1     Running   0             37m
default           alertmanager-prometheus-kube-prometheus-alertmanager-0   2/2     Running   0             31m
default           metrics-test-00001-deployment-54b7f678f6-pfhng           2/2     Running   0             25m
default           prometheus-grafana-69f9ccfd8d-ztcd7                      3/3     Running   0             31m
default           prometheus-kube-prometheus-operator-6f4fc4dcbd-sz625     1/1     Running   0             31m
default           prometheus-kube-state-metrics-57c8464f66-rlshs           1/1     Running   0             31m
default           prometheus-prometheus-kube-prometheus-prometheus-0       2/2     Running   0             31m
default           prometheus-prometheus-node-exporter-wzcc6                1/1     Running   0             31m
istio-system      istio-ingressgateway-5f8bcfbff9-2sccm                    1/1     Running   0             33m
istio-system      istio-ingressgateway-5f8bcfbff9-q4zbn                    1/1     Running   0             33m
istio-system      istio-ingressgateway-5f8bcfbff9-qhqp5                    1/1     Running   0             33m
istio-system      istiod-85877f7d98-cftnp                                  1/1     Running   0             33m
istio-system      istiod-85877f7d98-qk6rw                                  1/1     Running   0             33m
istio-system      istiod-85877f7d98-rh9kn                                  1/1     Running   0             33m
keda              keda-admission-webhooks-685d94fcff-lqcdg                 1/1     Running   0             31m
keda              keda-operator-65f5568c7b-xpfw5                           1/1     Running   1 (31m ago)   31m
keda              keda-operator-metrics-apiserver-69c577c9cf-ghthq         1/1     Running   0             31m
knative-serving   activator-d66fd5dd8-9phqr                                1/1     Running   0             36m
knative-serving   autoscaler-6c7bf97997-rkd2n                              1/1     Running   0             36m
knative-serving   autoscaler-keda-7f87794cb7-g2wm8                         1/1     Running   0             28m
knative-serving   controller-5b54cd98c-bzgpt                               1/1     Running   0             36m
knative-serving   net-istio-controller-c9444c8ff-rwcp5                     1/1     Running   0             33m
knative-serving   net-istio-webhook-66b6b6444c-zpxjg                       1/1     Running   0             33m
knative-serving   webhook-56ffd84996-ck5tm                                 1/1     Running   0             36m
kube-system       coredns-5dd5756b68-svl4l                                 1/1     Running   0             37m
kube-system       etcd-minikube                                            1/1     Running   0             37m
kube-system       kube-apiserver-minikube                                  1/1     Running   0             37m
kube-system       kube-controller-manager-minikube                         1/1     Running   0             37m
kube-system       kube-proxy-fgj9l                                         1/1     Running   0             37m
kube-system       kube-scheduler-minikube                                  1/1     Running   0             37m
kube-system       storage-provisioner                                      1/1     Running   0             37m

During scaling:

$ kubectl get pod -A
NAMESPACE         NAME                                                     READY   STATUS              RESTARTS      AGE
cert-manager      cert-manager-67c98b89c8-2qvqt                            1/1     Running             0             38m
cert-manager      cert-manager-cainjector-5c5695d979-wbhth                 1/1     Running             0             38m
cert-manager      cert-manager-webhook-7f9f8648b9-22wf5                    1/1     Running             0             38m
default           alertmanager-prometheus-kube-prometheus-alertmanager-0   2/2     Running             0             32m
default           metrics-test-00001-deployment-54b7f678f6-4wttg           2/2     Running             0             15s
default           metrics-test-00001-deployment-54b7f678f6-j8bh8           2/2     Running             0             15s
default           metrics-test-00001-deployment-54b7f678f6-pfhng           2/2     Running             0             26m
default           metrics-test-00001-deployment-54b7f678f6-vc4lg           0/2     ContainerCreating   0             0s
default           metrics-test-00001-deployment-54b7f678f6-wkfmk           0/2     ContainerCreating   0             0s
default           metrics-test-00001-deployment-54b7f678f6-wv27r           0/2     ContainerCreating   0             0s
default           metrics-test-00001-deployment-54b7f678f6-x5kn5           2/2     Running             0             15s
default           metrics-test-00001-deployment-54b7f678f6-xz4fb           0/2     ContainerCreating   0             0s
default           prometheus-grafana-69f9ccfd8d-ztcd7                      3/3     Running             0             32m
default           prometheus-kube-prometheus-operator-6f4fc4dcbd-sz625     1/1     Running             0             32m
default           prometheus-kube-state-metrics-57c8464f66-rlshs           1/1     Running             0             32m
default           prometheus-prometheus-kube-prometheus-prometheus-0       2/2     Running             0             32m
default           prometheus-prometheus-node-exporter-wzcc6                1/1     Running             0             32m
istio-system      istio-ingressgateway-5f8bcfbff9-2sccm                    1/1     Running             0             35m
istio-system      istio-ingressgateway-5f8bcfbff9-q4zbn                    1/1     Running             0             35m
istio-system      istio-ingressgateway-5f8bcfbff9-qhqp5                    1/1     Running             0             35m
istio-system      istiod-85877f7d98-cftnp                                  1/1     Running             0             34m
istio-system      istiod-85877f7d98-qk6rw                                  1/1     Running             0             34m
istio-system      istiod-85877f7d98-rh9kn                                  1/1     Running             0             35m
keda              keda-admission-webhooks-685d94fcff-lqcdg                 1/1     Running             0             32m
keda              keda-operator-65f5568c7b-xpfw5                           1/1     Running             1 (32m ago)   32m
keda              keda-operator-metrics-apiserver-69c577c9cf-ghthq         1/1     Running             0             32m
knative-serving   activator-d66fd5dd8-9phqr                                1/1     Running             0             38m
knative-serving   autoscaler-6c7bf97997-rkd2n                              1/1     Running             0             38m
knative-serving   autoscaler-keda-7f87794cb7-g2wm8                         1/1     Running             0             29m
knative-serving   controller-5b54cd98c-bzgpt                               1/1     Running             0             38m
knative-serving   net-istio-controller-c9444c8ff-rwcp5                     1/1     Running             0             34m
knative-serving   net-istio-webhook-66b6b6444c-zpxjg                       1/1     Running             0             34m
knative-serving   webhook-56ffd84996-ck5tm                                 1/1     Running             0             38m
kube-system       coredns-5dd5756b68-svl4l                                 1/1     Running             0             38m
kube-system       etcd-minikube                                            1/1     Running             0             39m
kube-system       kube-apiserver-minikube                                  1/1     Running             0             39m
kube-system       kube-controller-manager-minikube                         1/1     Running             0             39m
kube-system       kube-proxy-fgj9l                                         1/1     Running             0             38m
kube-system       kube-scheduler-minikube                                  1/1     Running             0             39m
kube-system       storage-provisioner                                      1/1     Running             0             39m

Questions

@skonto would you like me to move forward in this PR and document also injection? I have a version working already, just though of splitting it as I wanted to also document some of those scaling from zero consideration we made on Slack.

/kind documentation
/kind cleanup
/kind enhancement

[linux-foundation-easycla]

• ✅login: muscionig / (c2283c1)
• ✅login: muscionig / (c2283c1, 2c60e1e)
• ✅login: muscionig / (c2283c1, 2c60e1e, 6f32429)

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[knative-prow]

Welcome @muscionig! It looks like this is your first PR to knative-extensions/autoscaler-keda 🎉

[knative-prow]

Hi @muscionig. Thanks for your PR.

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