Data Prepper developer documentation for debugging and using Maven artifacts. (opensearch-project#6427)

Signed-off-by: David Venable <dlv@amazon.com>

Author: dlvenable

docs/debugging.md

@@ -0,0 +1,22 @@
+# Debugging Data Prepper
+
+This page serves as a guide to debugging Data Prepper.
+You can enable Java debugging by using `JAVA_OPTS`.
+
+
+## Docker
+
+The following Docker compose snippet shows you how to set up debugging for Docker compose.
+
+```yaml
+services:
+  data-prepper:
+    container_name: data-prepper
+    image: opensearchproject/data-prepper:2
+    ports:
+      - "5005:5005"
+      # other ports you need
+    environment:
+      - JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005
+    # More configuration
+```

docs/developer_guide.md

@@ -256,5 +256,6 @@ which includes a summary of the results.
 We have the following pages for specific development guidance on the topics:
 
 * [Plugin Development](plugin_development.md)
+* [Debugging Data Prepper](debugging.md)
 * [Error Handling](error_handling.md)
 * [Logs](logs.md)

docs/plugin_development.md

@@ -29,16 +29,62 @@ If your plugin requires no arguments, it can use a default constructor which wil
 Additionally, the plugin framework can create a plugin using a single parameter constructor with
 a single parameter of type `PluginSetting`. This behavior is deprecated and planned for removal.
 
-## Deploying Maven Artifacts
+## Maven artifacts
 
 If you are developing a plugin in another Gradle project your project will depend on at least the `data-prepper-api` project.
-You can deploy this artifact locally so that you can add it as a dependency in your other project.
+The Data Prepper maintainers publish Data Prepper libraries to Maven Central.
 
-Run the following command:
+All Maven artifacts are published to the `org.opensearch.dataprepper` group id. 
+
+```
+org.opensearch.dataprepper:data-prepper-api:2.13.0
+```
+
+As a plugin developer, you should also consider using `org.opensearch.dataprepper.test:plugin-test-framework` to test your plugin.
+
+For example, to use in Gradle:
+
+```groovy
+dependencies {
+    implementation 'org.opensearch.dataprepper:data-prepper-api:2.13.0'
+    testImplementation 'org.opensearch.dataprepper.test:plugin-test-framework:2.13.0'
+}
+```
+
+Browse using Maven Central:
+
+* https://repo1.maven.org/maven2/org/opensearch/dataprepper/
+
+### Nightly snapshots
+
+Data Prepper Maven artifacts release nightly snapshot builds.
+
+The Maven repository is:
+* `https://central.sonatype.com/repository/maven-snapshots`
+
+For example, to use in Gradle:
+
+```groovy
+repositories {
+    // Other repositories such as mavenCentral()
+    maven {
+        name = "Snapshots"
+        url = "https://central.sonatype.com/repository/maven-snapshots"
+    }
+}
+```
+
+### Deploying Maven artifacts from local
+
+You can deploy Data Prepper artifacts locally so that you can add add any local changes as a dependency in your plugin project.
+
+From the Data Prepper repository, run the following command:
 
 ```
 ./gradlew publishToMavenLocal
 ```
 
 The Maven artifacts will then be available in your local Maven repository. In standard environments
 they will be available at `${USER}/.m2/repository/org/opensearch/dataprepper/`.
+
+Be sure to enable `mavenLocal()` as a repository in your plugin's build project.