update architecture diagram

Signed-off-by: zhu733756 <zhu733756@kubesphere.io>

docs/proposals/fluent_operator_20210907.md

@@ -2,29 +2,50 @@
 
 ## Table of contents
 
-- [Introduction](#Introduction)
-  - [Why adding Fluentd CRDs to Fluent Operator? ](#Why-adding-Fluentd-CRDs-to-Fluent-Operator? )
-  - [How to integrate fluentd ?](#How-to-integrate-fluentd)
-      - [Introduction to the types of CRD](#Introduction-to-the-types-of-CRD-and-workflow)
-      - [Support for namespaces isolation and cloud native selectors](#Support-for-namespaces-isolation-and-cloud-native-selectors)
-      - [Support for strict configuration validation](#Support-for-strict-configuration-validation)
-      - [Select popular Fluentd plugins to add CRD support](#Select-popular-fluentd-plugins-to-add-crd-support)
-      - [Support for custom plugins installation](#Support-for-custom-plugins-installation)
-      - [Enable filesystem pvc for buffer](#Enable-filesystem-pvc-for-buffer)
-      - [Add ClusterDirectives CRD to support directives predefined](#Add-ClusterDirectives-CRD-to-support-directives-predefined)
-- [Fluentd CRDs Design](#Fluentd-CRDs-Design)
-  - [Fluentd CRD](#Fluentd-CRD)
-  - [FluentdClusterConfig CRD Or FluentdConfig CRD](#FluentdClusterConfig-CRD-Or-FluentdConfig-CRD)
-  - [Output CRD Or ClusterOutput CRD](#Output-CRD-Or-ClusterOutput-CRD)
-  - [Configuration Supplement](#Configuration-Supplement)
-      - [Common Directive Configuration Supplement](#Common-Directive-Configuration-Supplement)
-      - [Buffer Directive Configuration Supplement](#Buffer-Directive-Configuration-Supplement)
-      - [Format Directive Configuration Supplement](#Format-Directive-Configuration-Supplement)
-      - [Inject Directive Configuration Supplement](#Inject-Directive-Configuration-Supplement)
-      - [Transport Directive Configuration Supplement](#Transport-Directive-Configuration-Supplement)
-      - [Storage Directive Configuration Supplement](#Storage-Directive-Configuration-Supplement)
-      - [Service Discovery Directive Configuration Supplement](#Service-Discovery-Directive-Configuration-Supplement)
-- [Parts that need to be discussed or added](#Parts-that-need-to-be-discussed-or-added)
+- [Proposal： Add Fluentd to Fluent Operator as an optional log aggregation and forwarding layer](#proposal-add-fluentd-to-fluent-operator-as-an-optional-log-aggregation-and-forwarding-layer)
+  - [Table of contents](#table-of-contents)
+  - [Introduction](#introduction)
+    - [FluentBit CRDs refactoring](#fluentbit-crds-refactoring)
+    - [Why adding Fluentd CRDs to Fluent Operator?](#why-adding-fluentd-crds-to-fluent-operator)
+    - [How to integrate fluentd?](#how-to-integrate-fluentd)
+      - [Introduction to the types of CRD and workflow:](#introduction-to-the-types-of-crd-and-workflow)
+      - [Support for namespaces isolation and cloud native selectors](#support-for-namespaces-isolation-and-cloud-native-selectors)
+      - [Support for strict configuration validation](#support-for-strict-configuration-validation)
+      - [Select popular Fluentd plugins to add CRD support](#select-popular-fluentd-plugins-to-add-crd-support)
+      - [Support for custom plugins installation](#support-for-custom-plugins-installation)
+      - [Enable filesystem pvc for buffer](#enable-filesystem-pvc-for-buffer)
+      - [Add ClusterDirectives CRD to support directives predefined](#add-clusterdirectives-crd-to-support-directives-predefined)
+  - [Fluentd CRDs Design](#fluentd-crds-design)
+    - [Fluentd CRD](#fluentd-crd)
+    - [FluentdClusterConfig CRD Or FluentdConfig CRD](#fluentdclusterconfig-crd-or-fluentdconfig-crd)
+      - [Input Section Of FluentdClusterConfig CRD or FluentdConfig CRD](#input-section-of-fluentdclusterconfig-crd-or-fluentdconfig-crd)
+        - [forward](#forward)
+        - [http](#http)
+      - [Filters Section Of the FluentdClusterConfig Crd or FluentdConfig Crd](#filters-section-of-the-fluentdclusterconfig-crd-or-fluentdconfig-crd)
+        - [record_transformer](#record_transformer)
+        - [grep](#grep)
+        - [parser](#parser)
+        - [stdout](#stdout)
+    - [Output CRD Or ClusterOutput CRD](#output-crd-or-clusteroutput-crd)
+      - [forward](#forward-1)
+      - [http](#http-1)
+      - [stdout](#stdout-1)
+      - [kafka](#kafka)
+      - [elasticsearch](#elasticsearch)
+      - [s3](#s3)
+    - [Configuration Supplement](#configuration-supplement)
+      - [Common Directive Configuration Supplement](#common-directive-configuration-supplement)
+        - [type](#type)
+        - [id](#id)
+        - [log_level](#log_level)
+          - [label](#label)
+      - [Buffer Directive Configuration Supplement](#buffer-directive-configuration-supplement)
+      - [Format Directive Configuration Supplement](#format-directive-configuration-supplement)
+      - [Inject Directive Configuration Supplement](#inject-directive-configuration-supplement)
+      - [Transport Directive Configuration Supplement](#transport-directive-configuration-supplement)
+      - [Storage Directive Configuration Supplement](#storage-directive-configuration-supplement)
+      - [Service Discovery Directive Configuration Supplement](#service-discovery-directive-configuration-supplement)
+  - [Parts that need to be discussed or added](#parts-that-need-to-be-discussed-or-added)
 
 
 ## Introduction
@@ -43,7 +64,7 @@ Now all FluentBit CRDs are namespace level. We should use cluster level CRDs for
 
 The following table from [Fluent Bit documentation](https://docs.fluentbit.io/manual/about/fluentd-and-fluent-bit) describes a comparison in different areas of the two projects:
 
-![image-20210618114950689](https://raw.githubusercontent.com/zhu733756/bedpic/main/images/image-20210618114950689.png)
+![image-20210618114950689](https://raw.githubusercontent.com/fluent/fluentbit-operator/master/docs/images/fluent-operator.svg)
 
 The rich plugins is one of the reasons, which helps to do better handling of logging in some complex scenarios.