Add quickstart guide

Signed-off-by: Stefan Prodan <[email protected]>

README.md

@@ -1,2 +1,97 @@
 # flux2-monitoring-example
-Prometheus monitoring for the Flux control plane
+
+This repository is an example of how to make use of
+[kube-prometheus-stack](https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack)
+and
+[loki-stack](https://github.com/grafana/helm-charts/tree/main/charts/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
+
+## Quickstart
+
+### Create a Kubernetes cluster
+
+For a quick local test, you can use [Kubernetes kind](https://kind.sigs.k8s.io/docs/user/quick-start/).
+Any other Kubernetes setup will work as well though.
+
+Create a cluster called `test` with the kind CLI:
+
+```shell
+kind create cluster --name test
+```
+
+### Fork the GitHub repository
+
+In order to follow this guide you'll need a GitHub account and a
+[personal access token](https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line)
+that can create repositories (check all permissions under `repo`).
+
+Add the GitHub PAT and username to your shell environment:
+
+```sh
+export GITHUB_TOKEN=<your-token>
+export GITHUB_USER=<your-username>
+```
+
+Fork this repository on your personal account and clone it locally:
+
+```shell
+git clone https://github.com/${GITHUB_USER}/flux2-monitoring-example.git
+cd flux2-monitoring-example
+```
+
+### Bootstrap Flux
+
+Install the Flux controllers on the test cluster:
+
+```shell
+flux bootstrap github \
+    --owner=${GITHUB_USER} \
+    --repository=flux2-monitoring-example \
+    --branch=main \
+    --personal \
+    --path=clusters/test
+```
+
+Wait for Flux to deploy the monitoring stack with:
+
+```shell
+flux get kustomizations --watch
+```
+
+After Flux has finished reconciling, you can list the pods in the monitoring namespace with:
+
+```console
+$ 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
+```
+
+### Accessing Grafana
+
+To access Grafana, start port forward in a separate shell:
+
+```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](http://localhost:3000/d/flux-cluster/flux-cluster-stats)
+- [Control plane stats](http://localhost:3000/d/flux-control-plane/flux-control-plane)
+- [Control plane logs](http://localhost:3000/d/flux-logs/flux-logs)