docs: add instructions for Camel plugin

Fix hawtio/hawtio-react#1824

Author: tadayosi

modules/ROOT/nav.adoc

@@ -5,6 +5,7 @@
 * Using Hawtio
 ** xref:configuration.adoc[]
 ** xref:plugins.adoc[]
+*** xref:plugins/camel.adoc[]
 * Securing Hawtio
 ** xref:security.adoc[]
 ** xref:oidc.adoc[]

modules/ROOT/pages/plugins.adoc

@@ -17,7 +17,7 @@ The following plugins are all included by default in Hawtio:
 |===
 |Plugin |Description
 
-|https://github.com/hawtio/hawtio-next/tree/main/packages/hawtio/src/plugins/camel[Camel]
+|xref:plugins/camel.adoc[Camel]
 a|Adds support for https://camel.apache.org[Apache Camel]. Allows you to browse Camel contexts, routes, endpoints, etc.; visualise running routes and their metrics; create endpoints; send messages; trace message flows; and profile routes to identify which parts runs fast or slow.
 
 Requirements:: A Camel application needs to be running in the JVM. The Camel application needs to include https://camel.apache.org/manual/jmx.html[Camel Management] component to enable JMX. The Source tab requires https://camel.apache.org/components/3.21.x/others/java-xml-jaxb-dsl.html[Camel XML DSL] support. The Debug tab requires https://camel.apache.org/components/3.21.x/others/debug.html[Camel Debug] component. The Trace tab requires enabling of https://camel.apache.org/manual/tracer.html[Camel Tracer].

modules/ROOT/pages/plugins/camel.adoc

@@ -0,0 +1,61 @@
+= Camel
+
+The Camel plugin adds support for https://camel.apache.org[Apache Camel]. It allows you to browse Camel contexts, routes, endpoints, etc.; visualise running routes and their metrics; create endpoints; send messages; trace message flows; and profile routes to identify which parts runs fast or slow.
+
+== Requirements
+
+A Camel application needs to be running in the JVM, which needs to include https://camel.apache.org/manual/jmx.html[Camel Management] component to enable JMX.
+
+=== Source
+
+The Source tab requires https://camel.apache.org/components/3.21.x/others/java-xml-jaxb-dsl.html[Camel XML DSL] support.
+
+=== Debug
+
+The Debug tab requires https://camel.apache.org/components/3.21.x/others/debug.html[Camel Debug] component.
+
+=== Trace
+
+The Trace tab requires enabling of https://camel.apache.org/manual/tracer.html[Camel Tracer].
+
+=== Exchanges
+
+To enable browsing of inflight exchanges in the **Exchanges** tab, the following Camel Main option needs to be enabled:
+
+[source,java]
+.`application.properties`
+----
+camel.main.inflight-repository-browse-enabled = true
+----
+
+=== Endpoints (in/out)
+
+To activate the **Endpoints (in/out)** tab, either or both of the following Camel Main options need to be enabled:
+
+[source,java]
+.`application.properties`
+----
+camel.main.endpoint-runtime-statistics-enabled = true
+camel.main.jmx-management-statistics-level = Extended
+----
+
+== Usage
+
+Click the Camel tab in the top navigation bar to view the running Camel Context in the current JVM.
+The selection will not appear on the navigation bar if there is no Camel Context running.
+
+The Camel plugin allows you to view all the running Camel applications in the current JVM.
+You can among others see the following details:
+
+- Lists of all running Camel applications
+- Detailed information of each Camel Context such as Camel version number, runtime statics
+- Lists of all routes in each Camel applications and their runtime statistics
+- Manage the lifecycle of all Camel applications and their routes, so you can restart / stop / pause / resume, etc.
+- Graphical representation of the running routes along with real time metrics
+- Live tracing and debugging of running routes
+- Profile the running routes with real time runtime statics; detailed specified per processor
+- Browsing and sending messages to Camel endpoint
+
+== Source
+
+https://github.com/hawtio/hawtio-next/tree/main/packages/hawtio/src/plugins/camel