Add Wavefront enabled Task demo

monitoring-samples/task-apps/task-demo-metrics-wavefront/README.md

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+
+# How to monitor Spring Cloud Task
+
+The `task-demo-metrics-wavefront` project creates a sample Spring Cloud Task (and Spring Batch) with the monitoring infrastructure, so it can be monitored in Spring Cloud Data Flow.  
+
+## Create custom Spring Cloud Task
+If you use the provided `task-demo-metrics-wavefront` source code you can skip this section. 
+
+Otherwise, follow the instructions below to build new Task with enabled Wavefront monitoring  
+
+Follow the [Task development instructions](https://docs.spring.io/spring-cloud-task/docs/2.0.0.RELEASE/reference/htmlsingle/#getting-started-developing-first-task) and then: 
+
+* Set the parent `POM` version of Boot to 2.3.1.RELEASE or latest
+
+```xml
+<parent>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-parent</artifactId>
+    <version>2.3.1.RELEASE</version>
+    <relativePath/>
+</parent>
+``` 
+* Make sure that `spring-cloud-dependencies` version `Hoxton.SR6` or newer are imported: 
+
+```xml
+<dependencyManagement>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-dependencies</artifactId>
+            <version>Hoxton.SR6</version>
+            <type>pom</type>
+            <scope>import</scope>
+        </dependency>
+    </dependencies>
+</dependencyManagement>
+```
+
+* Add dependencies to enable the `Spring Cloud Task` (and optionally `Spring Task Batch`) functionality and to configure the jdbc dependencies for the task repository. 
+
+```xml
+<dependencies>
+    <dependency>
+        <groupId>org.springframework.cloud</groupId>
+        <artifactId>spring-cloud-starter-task</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-batch</artifactId>
+    </dependency>
+</dependencies>
+``` 
+
+* Add dependencies to configure the jdbc dependencies for the task repository: 
+
+```xml
+<dependency>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-jdbc</artifactId>
+</dependency>
+<dependency>
+    <groupId>org.mariadb.jdbc</groupId>
+    <artifactId>mariadb-java-client</artifactId>
+    <scope>runtime</scope>
+</dependency>
+``` 
+
+* Add dependencies to configure Micrometer integration: 
+
+```xml
+<dependency>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-actuator</artifactId>
+</dependency>
+
+<dependency>
+    <groupId>io.micrometer</groupId>
+    <artifactId>micrometer-registry-wavefront</artifactId>
+</dependency>
+```
+ 
+## Build
+
+Run 
+```
+./mvnw clean install
+```
+
+Will produce `task-demo-metrics-wavefront-0.0.1-SNAPSHOT.jar` task application under the `target` folder.
+
+## Spring Cloud Data Flow server
+
+Follow the [Task Monitoring](https://dataflow.spring.io/docs/feature-guides/batch/monitoring) instructions  to register, run and monitor the task sample using Influx, Wavefront or Prometheus on the desired platform.
+
+## Docker images
+
+Build and publish docker image
+
+```
+./mvnw clean install docker:build
+./mvnw docker:push
+
+```