add prometheus operator install docs

Author: googs1025

docs/prometheus-operator/README.md

@@ -0,0 +1,76 @@
+# Install Prometheus-operator steps 
+
+Currently, llmaz has already integrated metrics. This document provides deployment steps explaining how to install and configure Prometheus Operator in a Kubernetes cluster.
+
+### Install the prometheus operator
+
+Please follow the [documentation](https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/getting-started/installation.md) to install 
+
+```bash
+# Installing the prometheus operator
+root@VM-0-5-ubuntu:/home/ubuntu# kubectl get pods
+NAME                                   READY   STATUS    RESTARTS   AGE
+prometheus-operator-55b5c96cf8-jl2nx   1/1     Running   0          12s
+```
+Ensure that the Prometheus Operator Pod is running successfully.
+
+### Install the ServiceMonitor CR for llmaz 
+
+To enable monitoring for the llmaz system, you need to install the ServiceMonitor custom resource (CR). 
+You can either modify the Helm chart prometheus according to the [documentation](./../../chart/values.global.yaml) or use `make install-prometheus` in Makefile.
+
+- Using Helm Chart: to modify the values.global.yaml
+```yaml
+prometheus:
+  # -- Whether to enable Prometheus metrics exporting.
+  enable: true
+```
+- Using Makefile Command: `make install-prometheus `
+```bash
+root@VM-0-5-ubuntu:/home/ubuntu/llmaz# make install-prometheus
+kubectl apply --server-side -k config/prometheus
+serviceaccount/llmaz-prometheus serverside-applied
+clusterrole.rbac.authorization.k8s.io/llmaz-prometheus serverside-applied
+clusterrolebinding.rbac.authorization.k8s.io/llmaz-prometheus serverside-applied
+prometheus.monitoring.coreos.com/llmaz-prometheus serverside-applied
+servicemonitor.monitoring.coreos.com/llmaz-controller-manager-metrics-monitor serverside-applied
+```
+
+### Check Related Resources
+
+Verify that the necessary resources have been created:
+
+- ServiceMonitor
+```bash
+root@VM-0-5-ubuntu:/home/ubuntu/llmaz# kubectl get ServiceMonitor -n llmaz-system
+NAME                                       AGE
+llmaz-controller-manager-metrics-monitor   59s
+```
+- Prometheus Pods
+```bash
+root@VM-0-5-ubuntu:/home/ubuntu/llmaz# kubectl get pods -n llmaz-system
+NAME                                        READY   STATUS    RESTARTS   AGE
+llmaz-controller-manager-7ff8f7d9bd-vztls   2/2     Running   0          28s
+prometheus-llmaz-prometheus-0               2/2     Running   0          27s
+```
+- Services
+```bash
+root@VM-0-5-ubuntu:/home/ubuntu/llmaz# kubectl get svc -n llmaz-system
+NAME                                       TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
+llmaz-controller-manager-metrics-service   ClusterIP   10.96.79.226    <none>        8443/TCP   46s
+llmaz-webhook-service                      ClusterIP   10.96.249.226   <none>        443/TCP    46s
+prometheus-operated                        ClusterIP   None            <none>        9090/TCP   45s
+```
+
+### View metrics using the prometheus UI
+Use port forwarding to access the Prometheus UI from your local machine:
+
+```bash
+root@VM-0-5-ubuntu:/home/ubuntu# kubectl port-forward services/prometheus-operated  39090:9090 --address 0.0.0.0 -n llmaz-system
+Forwarding from 0.0.0.0:39090 -> 9090
+```
+
+If using kind, we can use port-forward, `kubectl port-forward services/prometheus-operated  39090:9090 --address 0.0.0.0 -n llmaz-system`
+This allows us to access prometheus using a browser: `http://{ecs public IP}:39090/query`
+
+![prometheus](prometheus.png?raw=true)