fix(ROX-31121): Monitoring deployment from Prometheus Community chart

[tommartensen]

Replace Bitnami kube-prometheus with Prometheus Community kube-prometheus-stack (83.5.1), refresh requirements.lock, and rewrite monitoring-values.yaml for the new subchart: same resource limits, PVC-backed Prometheus, disabled node/kube-state/kube control-plane scrapers, Slack routing via alertmanagerConfigSelector, tuned defaultRules for disabled targets, no custom image repos, and Grafana off.

Why: Bitnami kube-prometheus chart is outdated and the legacy images were deleted from DockerHub.

Also includes a fix for #1804 if NO_MONITORING is unset.

I tested the monitoring stack in a separate GKE cluster and it produced a test alert in Slack: https://redhat-internal.slack.com/archives/C06L0LDBEGZ/p1776413056761179

[rhacs-bot]

A single node development cluster (infra-pr-1807) was allocated in production infra for this PR.

CI will attempt to deploy quay.io/rhacs-eng/infra-server: to it.

🔌 You can connect to this cluster with:

gcloud container clusters get-credentials infra-pr-1807 --zone us-central1-a --project acs-team-temp-dev

🛠️ And pull infractl from the deployed dev infra-server with:

nohup kubectl -n infra port-forward svc/infra-server-service 8443:8443 &
make pull-infractl-from-dev-server

🚲 You can then use the dev infra instance e.g.:

bin/infractl -k -e localhost:8443 whoami

⚠️ Any clusters that you start using your dev infra instance should have a lifespan shorter then the development cluster instance. Otherwise they will not be destroyed when the dev infra instance ceases to exist when the development cluster is deleted. ⚠️

Further Development

☕ If you make changes, you can commit and push and CI will take care of updating the development cluster.

🚀 If you only modify configuration (chart/infra-server/configuration) or templates (chart/infra-server/{static,templates}), you can get a faster update with:

make helm-deploy

Logs

Logs for the development infra depending on your @redhat.com authuser:

• authuser=0
• authuser=1
• authuser=2

Or:

kubectl -n infra logs -l app=infra-server --tail=1 -f

[davdhacs]

🎆