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[doc]: add curve monitor design. #80

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[doc]: add curve monitor design. #80

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40 changes: 40 additions & 0 deletions docs/cn/CurveMonitor设计.md
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# 背景
当前CurveBS和CurveFS监控功能通过各自CRD中`monitor.enable`字段控制开关。
这种方式监控和集群一对一绑定，不支持多集群集中监控的场景。

# 现状
当前问题总结如下:
- 监控不支持多集群。
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这个先不考虑了~

- 不支持监控相关WorkLoad配置更新
- WorkLoad应该采用Sts代替Deployment.
- 一些高级功能不支持，如Prometheus配置动态更新，Thanos 生态集成等。

# 方案设计
![设计思路图](../images/curve-monitor.png)

CRD Yaml 示例:
```
apiVersion: operator.curve.io/v1
kind: CurveMonitor
metadata:
name: test
namespace: curve
spec:
replicas: 1
clusters:
- name: basic
type: curvefs
- name: basic2
type: curvebs
prometheus:
baseImage: prom/prometheus
version: v2.27.1
grafana:
baseImage: grafana/grafana
version: 7.5.11
prometheusReloader:
baseImage: quay.io/prometheus-operator/prometheus-config-reloader
version: v0.49.0
imagePullPolicy: IfNotPresent
```

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