This repository is an example of how to make use of kube-prometheus-stack and loki-stack to monitor Flux.

Components:

• kube-state-metrics - generates metrics about the state of the Flux objects
• Prometheus Operator - manages Prometheus clusters atop Kubernetes
• Prometheus - collects and stores metrics from the Flux controllers and kube-state-metrics
• Promtail - collects the logs from the Flux controllers
• Loki - stores the logs collected by Promtail
• Grafana dashboards - displays the Flux control plane resource usage, reconciliation stats and logs

For a quick local test, you can use Kubernetes kind. Any other Kubernetes setup will work as well though.

Create a cluster called test with the kind CLI:

kind create cluster --name test

In order to follow this guide you'll need a GitHub account and a personal access token that can create repositories (check all permissions under repo).

Add the GitHub PAT and username to your shell environment:

export GITHUB_TOKEN=<your-token>
export GITHUB_USER=<your-username>

Fork this repository on your personal account and clone it locally:

git clone https://github.com/${GITHUB_USER}/flux2-monitoring-example.git
cd flux2-monitoring-example

Install the Flux controllers on the test cluster:

flux bootstrap github \
    --owner=${GITHUB_USER} \
    --repository=flux2-monitoring-example \
    --branch=main \
    --personal \
    --path=clusters/test

Wait for Flux to deploy the monitoring stack with:

flux get kustomizations --watch

After Flux has finished reconciling, you can list the pods in the monitoring namespace with:

$ kubectl -n monitoring get po
NAME                                                        READY
kube-prometheus-stack-grafana-5c976ff4cf-xgmwm              3/3
kube-prometheus-stack-kube-state-metrics-5dcf4c4697-jvlvh   1/1
kube-prometheus-stack-operator-75f9fdcbf6-98zmh             1/1
kube-prometheus-stack-prometheus-node-exporter-j4vhb        1/1
loki-stack-0                                                1/1
loki-stack-promtail-dcg64                                   1/1
prometheus-kube-prometheus-stack-prometheus-0               2/2

To access Grafana, start port forward in a separate shell:

kubectl -n monitoring port-forward svc/kube-prometheus-stack-grafana  3000:80

Navigate to http://localhost:3000 in your browser and login with user admin and password flux.

Flux dashboards:

• Reconciliation stats
• Control plane stats
• Control plane logs