Deprecate Antrea Octant Plugin (antrea-io#4825)

We start updating the documentation to remove some references to Octant
and the plugin, add some pointers to the Antrea web UI, and add some
deprecation notices. The plugin code itself and all the build
infrastructure are preserved, until after the Antrea v1.12 release.

See antrea-io#4640

Signed-off-by: Antonin Bas <abas@vmware.com>

ROADMAP.md

@@ -29,14 +29,16 @@ We will continue to add more advanced NetworkPolicy features.
 
 * **Network diagnostics and observability**
 Network diagnostics and observability is one area we want to focus on. Antrea
-already implements some useful features on this front, including [Octant UI
-plugin](docs/octant-plugin-installation.md), [CLI](docs/antctl.md),
-[Traceflow](docs/traceflow-guide.md), [network flow export and visualization](docs/network-flow-visibility.md),
-[Prometheus metrics](docs/prometheus-integration.md), [OVS flow dumping](docs/antctl.md#dumping-ovs-flows)
-and [packet tracing](docs/antctl.md#ovs-packet-tracing), [NetworkPolicy
-diagnostics](docs/antctl.md#networkpolicy-commands). We will continue to
-enhance existing features and add new features to help diagnose K8s networking
-and NetworkPolicy implementation, and to provide good visibility into the Antrea
+already implements some useful features on this front, including the [Antrea
+UI](https://github.com/antrea-io/antrea-ui), [CLI](docs/antctl.md),
+[Traceflow](docs/traceflow-guide.md), [network flow export and
+visualization](docs/network-flow-visibility.md), [Prometheus
+metrics](docs/prometheus-integration.md), [OVS flow
+dumping](docs/antctl.md#dumping-ovs-flows) and [packet
+tracing](docs/antctl.md#ovs-packet-tracing), [NetworkPolicy
+diagnostics](docs/antctl.md#networkpolicy-commands). We will continue to enhance
+existing features and add new features to help diagnose K8s networking and
+NetworkPolicy implementation, and to provide good visibility into the Antrea
 network.
 
 * **NFV and Telco use cases**

docs/contributors/github-labels.md

@@ -24,7 +24,6 @@ The labels in this list originated within Kubernetes at
 | area/component/cni                 | Issues or PRs related to the cni component | Any |
 | area/component/controller          | Issues or PRs related to the Controller component | Any |
 | area/component/flow-aggregator     | Issues or PRs related to the Flow Aggregator component | Any |
-| area/component/octant-plugin       | Issues or PRs related to the octant-plugin component | Any |
 | area/dependency                    | Issues or PRs related to dependency changes | Any |
 | area/endpoint/identity             | Issues or PRs related to endpoint identity | Any |
 | area/endpoint/selection            | Issues or PRs related to endpoint selection | Any |
@@ -51,7 +50,6 @@ The labels in this list originated within Kubernetes at
 | area/network-policy/lifecycle      | Issues or PRs related to the network policy lifecycle | Any |
 | area/network-policy/match          | Issues or PRs related to matching packets | Any |
 | area/network-policy/precedence     | Issues or PRs related to network policy precedence | Any |
-| area/octant                        | Issues or PRs related to Octant | Any |
 | area/ops                           | Issues or PRs related to features which support network operations and troubleshooting | Any |
 | area/ops/traceflow                 | Issues or PRs related to the Traceflow feature | Any |
 | area/ovs/openflow                  | Issues or PRs related to Open vSwitch Open Flow | Any |

docs/design/architecture.md

@@ -25,10 +25,9 @@ init container that installs the CNI plugin - `antrea-cni` - on the Node and
 ensures that the OVS kernel module is loaded and it is chained with the portmap
 and bandwidth CNI plugins. All Antrea Controller, Agent, OVS daemons, and
 `antrea-cni` bits are included in a single Docker image. Antrea also has a
-command-line tool called `antctl`, and an [Octant](https://github.com/vmware-tanzu/octant)
-UI plugin.
+command-line tool called `antctl`.
 
-<img src="../assets/arch.svg.png" width="600" alt="Antrea Architecture Overview">
+<img src="../assets/arch.svg" width="600" alt="Antrea Architecture Overview">
 
 ### Antrea Controller
 
@@ -137,14 +136,17 @@ executed through `kubectl` as a `kubectl` plugin as well.
 When accessing the Agent, `antctl` connects to the Agent's local REST endpoint,
 and can only be executed locally in the Agent's container.
 
-### Octant UI plugin
+### Antrea web UI
 
-Antrea also implements an Octant plugin which can show the Controller and
-Agent's health and basic runtime information in the Octant UI. The Octant plugin
-gets the Controller and Agent's information from the `AntreaControllerInfo` and
-`AntreaAgentInfo` CRDs (Custom Resource Definition) in the Kubernetes API. The
-CRDs are created by the Antrea Controller and each Antrea Agent to populate
-their health and runtime information.
+Antrea also comes with a web UI, which can show the Controller and Agent's
+health and basic runtime information. The UI gets the Controller and Agent's
+information from the `AntreaControllerInfo` and `AntreaAgentInfo` CRDs (Custom
+Resource Definition) in the Kubernetes API. The CRDs are created by the Antrea
+Controller and each Antrea Agent to populate their health and runtime
+information.
+
+The Antrea web UI provides additional capabilities. Please refer to the [Antrea
+UI repository](https://github.com/antrea-io/antrea-ui) for more information.
 
 ## Pod Networking
 

docs/getting-started.md

@@ -212,11 +212,12 @@ are in different subnets, but does not encapsulate when the source and the
 destination Nodes are in the same subnet. Refer to [this guide](noencap-hybrid-modes.md)
 to learn how to configure Antrea with `NoEncap` or `Hybrid` mode.
 
-### Octant UI
+### Antrea Web UI
 
-Antrea ships with an Octant UI plugin which can show runtime information of Antrea
-components and perform Antrea Traceflow operations. Refer to [this guide](octant-plugin-installation.md)
-to learn how to install Octant and the Antrea plugin.
+Antrea comes with a web UI, which can show runtime information of Antrea
+components and perform Antrea Traceflow operations. Please refer to the [Antrea
+UI repository](https://github.com/antrea-io/antrea-ui) for installation
+instructions and more information.
 
 ### OVS Hardware Offload
 

docs/octant-plugin-installation.md

@@ -1,5 +1,11 @@
 # Octant and antrea-octant-plugin installation
 
+***Octant is no longer maintained and the antrea-octant-plugin is deprecated as
+   of Antrea v1.12. It will be removed completely in subsequent
+   releases. Please refer to [#4640](https://github.com/antrea-io/antrea/issues/4640)
+   for more information, and check out the [Antrea web UI](https://github.com/antrea-io/antrea-ui)
+   for an alternative.***
+
 ## Overview
 
 There are two ways to deploy Octant and antrea-octant-plugin.

docs/traceflow-guide.md

@@ -1,16 +1,16 @@
 # Traceflow User Guide
 
 Antrea supports using Traceflow for network diagnosis. It can inject a packet
-into OVS on a Node and trace the forwarding path of the packet across Nodes,
-and it can also trace a matched packet of real traffic from or to a Pod. In
-either case, a Traceflow operation is triggered by a Traceflow CRD which
-specifies the type of Traceflow, the source and destination of the packet to
-trace, and the headers of the packet. And the Traceflow results will be
-populated to the `status` field of the Traceflow CRD, which include the
-observations of the trace packet at various observations points in the
-forwarding path. Besides creating the Traceflow CRD using kubectl, users can
-also start a Traceflow using `antctl`, or from the Antrea Octant Plugin. When
-using the Antrea Octant plugin, the Traceflow results can be visualized using a
+into OVS on a Node and trace the forwarding path of the packet across Nodes, and
+it can also trace a matched packet of real traffic from or to a Pod. In either
+case, a Traceflow operation is triggered by a Traceflow CRD which specifies the
+type of Traceflow, the source and destination of the packet to trace, and the
+headers of the packet. And the Traceflow results will be populated to the
+`status` field of the Traceflow CRD, which include the observations of the trace
+packet at various observations points in the forwarding path. Besides creating
+the Traceflow CRD using kubectl, users can also start a Traceflow using
+`antctl`, or from the [Antrea web UI](https://github.com/antrea-io/antrea-ui).
+When using the Antrea web UI, the Traceflow results can be visualized using a
 graph.
 
 ## Table of Contents
@@ -22,7 +22,8 @@ graph.
   - [Using kubectl and YAML file (IPv6)](#using-kubectl-and-yaml-file-ipv6)
   - [Live-traffic Traceflow](#live-traffic-traceflow)
   - [Using antctl](#using-antctl)
-  - [Using Octant with antrea-octant-plugin](#using-octant-with-antrea-octant-plugin)
+  - [Using the Antrea web UI](#using-the-antrea-web-ui)
+  - [Using Octant with antrea-octant-plugin (DEPRECATED)](#using-octant-with-antrea-octant-plugin-deprecated)
 - [View Traceflow Result and Graph](#view-traceflow-result-and-graph)
 - [View Traceflow CRDs](#view-traceflow-crds)
 - [RBAC](#rbac)
@@ -51,8 +52,6 @@ is enabled in the Agent configuration:
       AntreaProxy: true
 ```
 
-For antrea-octant-plugin installation, please refer to [antrea-octant-installation](octant-plugin-installation.md).
-
 ## Start a New Traceflow
 
 You can choose to use `kubectl` together with a YAML file, the `antctl traceflow`
@@ -172,7 +171,19 @@ spec:
 
 Please refer to the corresponding [antctl page](antctl.md#traceflow).
 
-### Using Octant with antrea-octant-plugin
+### Using the Antrea web UI
+
+Please refer to the [Antrea UI documentation](https://github.com/antrea-io/antrea-ui)
+for installation instructions. Once you can access the UI in your browser,
+navigate to the `Traceflow` page.
+
+### Using Octant with antrea-octant-plugin (DEPRECATED)
+
+***Octant is no longer maintained and the antrea-octant-plugin is deprecated as
+   of Antrea v1.12. It will be removed completely in subsequent
+   releases. Please refer to [#4640](https://github.com/antrea-io/antrea/issues/4640)
+   for more information, and check out the [Antrea web UI](https://github.com/antrea-io/antrea-ui)
+   for an alternative.***
 
 <img src="https://downloads.antrea.io/static/tf_create.1.png" width="600" alt="Start a New Trace">
 

plugins/octant/cmd/antrea-octant-plugin/main.go

@@ -82,6 +82,8 @@ func main() {
 	// See https://github.com/vmware-tanzu/octant/issues/3012
 	logger.Info("antrea-octant-plugin is starting")
 	log.Printf("antrea-octant-plugin is starting")
+	logger.Info("***WARNING***: Octant is no longer maintained and this plugin is deprecated; it will be removed in the next Antrea release (see https://github.com/antrea-io/antrea/issues/4640)")
+	log.Printf("***WARNING***: Octant is no longer maintained and this plugin is deprecated; it will be removed in the next Antrea release (see https://github.com/antrea-io/antrea/issues/4640)")
 	p.Serve()
 }