Add ProxySQL Monitoring Docs

docs/guides/proxysql/monitoring/_index.md

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+---
+title: Monitoring ProxySQL
+menu:
+    docs_{{ .version }}:
+        identifier: guides-proxysql-monitoring
+        name: Monitoring
+        parent: guides-proxysql
+weight: 120
+menu_name: docs_{{ .version }}
+---

docs/guides/proxysql/monitoring/builtin-prometheus/examples/mysql.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: MySQL
+metadata:
+  name: mysql-grp
+  namespace: demo
+spec:
+  version: "5.7.36"
+  replicas: 3
+  topology:
+    mode: GroupReplication
+  storageType: Durable
+  storage:
+    storageClassName: "standard"
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 1Gi
+  terminationPolicy: WipeOut

docs/guides/proxysql/monitoring/builtin-prometheus/examples/prom-config.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: prometheus-config
+  labels:
+    app: prometheus-demo
+  namespace: monitoring
+data:
+  prometheus.yml: |-
+    global:
+      scrape_interval: 5s
+      evaluation_interval: 5s
+    scrape_configs:
+    - job_name: 'kubedb-databases'
+      honor_labels: true
+      scheme: http
+      kubernetes_sd_configs:
+      - role: endpoints
+      # by default Prometheus server select all Kubernetes services as possible target.
+      # relabel_config is used to filter only desired endpoints
+      relabel_configs:
+      # keep only those services that has "prometheus.io/scrape","prometheus.io/path" and "prometheus.io/port" anootations
+      - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape, __meta_kubernetes_service_annotation_prometheus_io_port]
+        separator: ;
+        regex: true;(.*)
+        action: keep
+      # currently KubeDB supported databases uses only "http" scheme to export metrics. so, drop any service that uses "https" scheme.
+      - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scheme]
+        action: drop
+        regex: https
+      # only keep the stats services created by KubeDB for monitoring purpose which has "-stats" suffix
+      - source_labels: [__meta_kubernetes_service_name]
+        separator: ;
+        regex: (.*-stats)
+        action: keep
+      # service created by KubeDB will have "app.kubernetes.io/name" and "app.kubernetes.io/instance" annotations. keep only those services that have these annotations.
+      - source_labels: [__meta_kubernetes_service_label_app_kubernetes_io_name]
+        separator: ;
+        regex: (.*)
+        action: keep
+      # read the metric path from "prometheus.io/path: <path>" annotation
+      - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_path]
+        action: replace
+        target_label: __metrics_path__
+        regex: (.+)
+      # read the port from "prometheus.io/port: <port>" annotation and update scraping address accordingly
+      - source_labels: [__address__, __meta_kubernetes_service_annotation_prometheus_io_port]
+        action: replace
+        target_label: __address__
+        regex: ([^:]+)(?::\d+)?;(\d+)
+        replacement: $1:$2
+      # add service namespace as label to the scraped metrics
+      - source_labels: [__meta_kubernetes_namespace]
+        separator: ;
+        regex: (.*)
+        target_label: namespace
+        replacement: $1
+        action: replace
+      # add service name as a label to the scraped metrics
+      - source_labels: [__meta_kubernetes_service_name]
+        separator: ;
+        regex: (.*)
+        target_label: service
+        replacement: $1
+        action: replace
+      # add stats service's labels to the scraped metrics
+      - action: labelmap
+        regex: __meta_kubernetes_service_label_(.+)

docs/guides/proxysql/monitoring/builtin-prometheus/examples/proxysql.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: ProxySQL
+metadata:
+  name: proxy-server
+  namespace: demo
+spec:
+  version: "2.4.4-debian"
+  replicas: 3
+  mode: GroupReplication
+  backend:
+    name: mysql-grp
+  syncUsers: true
+  monitor:
+    agent: prometheus.io/operator
+  terminationPolicy: WipeOut
+  healthChecker:
+    failureThreshold: 3