183-keda.sh

# Source: https://gist.github.com/2dad051fe41bd2bbcf94eda74386ce49

#############################################
# KEDA: Kubernetes Event-Driven Autoscaling #
# https://youtu.be/3lcaawKAv6s              #
#############################################

# Additional Info:
# - KEDA: https://keda.sh
# - Robusta: https://robusta.dev
# - Kubernetes Notifications, Troubleshooting, And Automation With Robusta: https://youtu.be/2P76WVVua8w
# - The Best Performance And Load Testing Tool? k6 By Grafana Labs: https://youtu.be/5OgQuVAR14I

#########
# Setup #
#########

# Create a Kubernetes cluster

# The Gist was NOT tested with local Kubernetes cluster (e.g., minikube, Rancher Desktop, etc.).
# Some changes might be required

helm repo add traefik \
    https://helm.traefik.io/traefik

helm repo update

helm upgrade --install traefik traefik/traefik \
    --namespace traefik --create-namespace --wait

# If NOT EKS
export INGRESS_HOST=$(kubectl --namespace traefik \
    get svc traefik \
    --output jsonpath="{.status.loadBalancer.ingress[0].ip}")

# If EKS
export INGRESS_HOSTNAME=$(kubectl --namespace traefik \
    get svc traefik \
    --output jsonpath="{.status.loadBalancer.ingress[0].hostname}")

# If EKS
export INGRESS_HOST=$(dig +short $INGRESS_HOSTNAME)

echo $INGRESS_HOST

# Repeat the `export` command(s) if the output is empty.

# If the output contains more than one IP, wait for a while longer, and repeat the `export` commands.

# If the output continues having more than one IP, choose one of them and execute `export INGRESS_HOST=[...]` with `[...]` being the selected IP.

git clone https://github.com/vfarcic/keda-demo

cd keda-demo

# Install `yq` from https://github.com/mikefarah/yq if you do not have it already
yq --inplace \
    ".spec.rules[0].host = \"dot.$INGRESS_HOST.nip.io\"" \
    k8s/ing.yaml

cat k6.js \
    | sed -e "s@http\.get.*@http\.get('http://dot.$INGRESS_HOST.nip.io');@g" \
    | tee k6.js

cat k6-100.js \
    | sed -e "s@http\.get.*@http\.get('http://dot.$INGRESS_HOST.nip.io');@g" \
    | tee k6-100.js

kubectl create namespace production

kubectl --namespace production \
    apply --filename k8s/

helm repo add kedacore \
    https://kedacore.github.io/charts

helm repo add robusta \
    https://robusta-charts.storage.googleapis.com

helm repo add prometheus-community \
    https://prometheus-community.github.io/helm-charts

helm repo update

helm install keda kedacore/keda \
    --namespace keda \
    --create-namespace \
    --wait

helm upgrade --install \
    prometheus prometheus-community/prometheus \
    --namespace monitoring \
    --create-namespace \
    --wait

# Execute only if you do not already have Robusta CLI
pip install -U robusta-cli --no-cache

robusta gen-config

# Follow the instructions from the Wizard
# Do NOT choose to install Prometheus (it's already installed)

helm upgrade --install robusta robusta/robusta \
    --namespace monitoring --create-namespace \
    --values generated_values.yaml \
    --values robusta-values.yaml \
    --set clusterName=dot --wait

#######################################
# Auto-Scaling Applications With KEDA #
#######################################

echo "http://dot.$INGRESS_HOST.nip.io"

# Open it in a browser

kubectl --namespace production \
    get pods

cat keda-prom.yaml

kubectl --namespace production apply \
    --filename keda-prom.yaml

k6 run k6.js

cat robusta-values.yaml

kubectl --namespace production \
    get pods,hpa,scaledobjects

cat k6-100.js

k6 run k6-100.js

kubectl --namespace production \
    get pods,hpa,scaledobjects

kubectl --namespace production \
    get pods,hpa,scaledobjects

cat keda-prom.yaml

# Open https://keda.sh/docs/scalers/

# Open https://github.com/knative-sandbox/eventing-autoscaler-keda

###########
# Destroy #
###########

# Destroy or reset the cluster

I'm glad it worked out.

Something must have changed in Robusta so that the clusterName is now required. Thanks for letting me know. The Gist has been updated...