diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/.gitignore b/kafka-streams-samples/kafka-streams-metrics-demo/.gitignore
new file mode 100644
index 0000000..549e00a
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/.gitignore
@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/MavenWrapperDownloader.java b/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/MavenWrapperDownloader.java
new file mode 100644
index 0000000..e76d1f3
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/MavenWrapperDownloader.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2007-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+ private static final String WRAPPER_VERSION = "0.5.6";
+ /**
+ * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+ */
+ private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+ + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+ /**
+ * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+ * use instead of the default one.
+ */
+ private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+ ".mvn/wrapper/maven-wrapper.properties";
+
+ /**
+ * Path where the maven-wrapper.jar will be saved to.
+ */
+ private static final String MAVEN_WRAPPER_JAR_PATH =
+ ".mvn/wrapper/maven-wrapper.jar";
+
+ /**
+ * Name of the property which should be used to override the default download url for the wrapper.
+ */
+ private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+ public static void main(String args[]) {
+ System.out.println("- Downloader started");
+ File baseDirectory = new File(args[0]);
+ System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+ // If the maven-wrapper.properties exists, read it and check if it contains a custom
+ // wrapperUrl parameter.
+ File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+ String url = DEFAULT_DOWNLOAD_URL;
+ if(mavenWrapperPropertyFile.exists()) {
+ FileInputStream mavenWrapperPropertyFileInputStream = null;
+ try {
+ mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+ Properties mavenWrapperProperties = new Properties();
+ mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+ url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+ } catch (IOException e) {
+ System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+ } finally {
+ try {
+ if(mavenWrapperPropertyFileInputStream != null) {
+ mavenWrapperPropertyFileInputStream.close();
+ }
+ } catch (IOException e) {
+ // Ignore ...
+ }
+ }
+ }
+ System.out.println("- Downloading from: " + url);
+
+ File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+ if(!outputFile.getParentFile().exists()) {
+ if(!outputFile.getParentFile().mkdirs()) {
+ System.out.println(
+ "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+ }
+ }
+ System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+ try {
+ downloadFileFromURL(url, outputFile);
+ System.out.println("Done");
+ System.exit(0);
+ } catch (Throwable e) {
+ System.out.println("- Error downloading");
+ e.printStackTrace();
+ System.exit(1);
+ }
+ }
+
+ private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+ if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+ String username = System.getenv("MVNW_USERNAME");
+ char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+ Authenticator.setDefault(new Authenticator() {
+ @Override
+ protected PasswordAuthentication getPasswordAuthentication() {
+ return new PasswordAuthentication(username, password);
+ }
+ });
+ }
+ URL website = new URL(urlString);
+ ReadableByteChannel rbc;
+ rbc = Channels.newChannel(website.openStream());
+ FileOutputStream fos = new FileOutputStream(destination);
+ fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+ fos.close();
+ rbc.close();
+ }
+
+}
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/maven-wrapper.jar b/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/maven-wrapper.jar
new file mode 100644
index 0000000..2cc7d4a
Binary files /dev/null and b/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/maven-wrapper.jar differ
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/maven-wrapper.properties b/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 0000000..642d572
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/README.adoc b/kafka-streams-samples/kafka-streams-metrics-demo/README.adoc
new file mode 100644
index 0000000..97ece3a
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/README.adoc
@@ -0,0 +1,171 @@
+== What is this app?
+
+This is an application where we demonstrate a basic Kafka Streams application and then enable Kafka Streams metrics through Prometheus and Micrometer.
+
+The following Prometheus micrometer dependencies are added to the maven configuration.
+
+```
+
+ io.micrometer
+ micrometer-registry-prometheus
+
+
+ io.micrometer.prometheus
+ prometheus-rsocket-spring
+ ${prometheus-rsocket.version}
+
+```
+
+=== Running the app:
+
+Go to the root of the repository and do:
+
+`./mvnw clean package`
+
+`java -jar target/kafka-streams-metrics-demo-0.0.1-SNAPSHOT.jar`
+
+Run the standalone producer which sends data to the incoming topic for the above processor.
+The iteration size is set to 5000, adjust it according before running.
+
+Then go to: `http://localhost:9000/actuator/prometheus`
+
+You can also get a list of all the avaialable metrics through the standard Boot actuator metrics endpoint:
+
+`http://localhost:9000/actuator/metrics`
+
+There you can see all the metrics available through Kafka Streams metrics.
+
+### Here are some relevant metrics for this application (_if you ran the Producer as described above_)
+
+You should see valid data for the following metrics.
+
+You can find descriptions for these metrics in the Prometheus output.
+
+#### Kafka Conusumer metrics
+
+```
+kafka_consumer_fetch_manager_records_consumed_total
+kafka_consumer_fetch_manager_records_consumed_rate
+kafka_consumer_fetch_manager_records_lead_min
+kafka_consumer_fetch_manager_records_fetch_size_avg
+kafka_consumer_fetch_manager_records_fetch_size_max
+kafka_consumer_fetch_manager_records_fetch_latency_max
+kafka_consumer_fetch_manager_records_records_lag_avg
+kafka_consumer_fetch_manager_records_fetch_latency_avg
+kafka_consumer_fetch_manager_records_fetch_total
+kafka_consumer_fetch_manager_records_bytes_consumed_rate
+kafka_consumer_fetch_manager_records_lead
+kafka_consumer_fetch_manager_records_lead_avg
+kafka_consumer_fetch_manager_records_lag
+
+kafka_consumer_node_incoming_byte_rate
+kafka_consumer_node_incoming_byte_total
+kafka_consumer_response_total
+kafka_consumer_response_rate
+kafka_consumer_time_between_poll_avg
+kafka_consumer_time_between_poll_max
+kafka_consumer_coordinator_commit_rate
+kafka_consumer_network_io_rate
+kafka_consumer_network_io_total
+kafka_consumer_node_outgoing_byte_total
+kafka_consumer_node_outgoing_byte_rate
+kafka_consumer_io_waittime_ns_avg
+kafka_consumer_io_ratio
+kafka_consumer_outgoing_byte_total
+kafka_consumer_outgoing_byte_rate
+kafka_consumer_poll_idle_ratio_avg
+kafka_consumer_io_wait_ratio
+kafka_consumer_request_total
+kafka_consumer_request_size_max
+kafka_consumer_node_request_rate
+kafka_consumer_node_incoming_byte_total
+kafka_consumer_iotime_total
+kafka_consumer_node_request_size_max
+kafka_consumer_incoming_byte_rate
+kafka_consumer_incoming_byte_total
+kafka_consumer_coordinator_heartbeat_rate
+kafka_consumer_select_rate
+kafka_consumer_select_total
+kafka_consumer_io_waittime_total
+kafka_consumer_node_request_total
+kafka_consumer_coordinator_commit_total
+kafka_consumer_io_waittime_total
+kafka_consumer_node_rquest_total
+kafka_consumer_io_time_ns_avg
+kafka_consumer_request_size_avg
+kafka_consumer_node_request_size_avg
+kafka_consumer_coordinator_last_rebalance_seconds_ago
+kafka_consumer_request_rate
+```
+
+#### Kafka Streams Metrics
+
+```
+kafka_stream_thread_process_total
+kafka_stream_thread_commit_total
+kafka_stream_thread_poll_total
+kafka_stream_thread_poll_latency_max
+kafka_stream_thread_process_latency_max
+kafka_stream_thread_poll_rate
+kafka_stream_thread_process_total
+kafka_stream_thread_process_rate
+kafka_stream_thread_process_latency_avg
+kafka_stream_thread_commit_latency_avg
+kafka_stream_thread_commit_latency_max
+kafka_stream_thread_commit_rate
+kafka_stream_thread_poll_latency_avg
+```
+
+#### Kafka Producer Metrics
+
+```
+kafka_producer_record_send_total
+kafka_producer_topic_record_send_total
+kafka_producer_buffer_total_bytes
+kafka_producer_io_waittime_total
+kafka_producer_io_time_ns_avg
+kafka_producer_compression_rate_avg
+kafka_producer_buffer_available_bytes
+kafka_producer_record_queue_time_max
+kafka_producer_reocord_queue_time_avg
+kafka_producer_batch_size_avg
+kafka_producer_response_total
+kafka_producer_response_rate
+kafka_producer_request_latecny_avg
+kafka_producer_record_size_max
+kafka_producer_select_total
+kafka_producer_request_reate
+kafka_producer_io_ratio
+kafka_producer_select_rate
+kafka_producer_request_total
+kafka_producer_node_request_size_avg
+kafka_producer_batch_size_max
+kafka_producer_send_rate
+kafka_producer_network_io_total
+kafka_producer_network_io_rate
+kafka_producer_node_response_rate
+kafka_producer_incoming_byte_total
+kafka_producer_iotime_total
+kafka_producer_io_wait_ratio
+kafka_producer_records_per_request_avg
+kafka_producer_request_size_avg
+kafka_producer_record_send_total
+kafka_producer_incoming_byte_rate
+kafka_producer_outgoing_byte_rate
+kafka_producer_outgoing_byte_total
+kafka_producer_record_size_avg
+kafka_producer_request_latency_max
+kafka_producer_request_size_max
+kafka_producer_topic_record_send_rate
+kafka_producer_topic_byte_total
+kafka_producer_topic_byte_rate
+kafka_producer_node_request_total
+kafka_producer_node_response_total
+kafka_producer_node_request_rate
+kafka_producer_node_incoming_byte_rate
+kafka_producer_node_incoming_byte_total
+kafka_producer_node_outgoing_byte_rate
+kafka_producer_node_outgoing_byte_total
+kafka_producer_node_request_size_max
+kafka_producer_node_request_lateny_avg
+```
\ No newline at end of file
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/mvnw b/kafka-streams-samples/kafka-streams-metrics-demo/mvnw
new file mode 100755
index 0000000..a16b543
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/mvnw
@@ -0,0 +1,310 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+# JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+# M2_HOME - location of maven2's installed home dir
+# MAVEN_OPTS - parameters passed to the Java VM when running Maven
+# e.g. to debug Maven itself, use
+# set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+# MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+ if [ -f /etc/mavenrc ] ; then
+ . /etc/mavenrc
+ fi
+
+ if [ -f "$HOME/.mavenrc" ] ; then
+ . "$HOME/.mavenrc"
+ fi
+
+fi
+
+# OS specific support. $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+ CYGWIN*) cygwin=true ;;
+ MINGW*) mingw=true;;
+ Darwin*) darwin=true
+ # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+ # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+ if [ -z "$JAVA_HOME" ]; then
+ if [ -x "/usr/libexec/java_home" ]; then
+ export JAVA_HOME="`/usr/libexec/java_home`"
+ else
+ export JAVA_HOME="/Library/Java/Home"
+ fi
+ fi
+ ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+ if [ -r /etc/gentoo-release ] ; then
+ JAVA_HOME=`java-config --jre-home`
+ fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+ ## resolve links - $0 may be a link to maven's home
+ PRG="$0"
+
+ # need this for relative symlinks
+ while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG="`dirname "$PRG"`/$link"
+ fi
+ done
+
+ saveddir=`pwd`
+
+ M2_HOME=`dirname "$PRG"`/..
+
+ # make it fully qualified
+ M2_HOME=`cd "$M2_HOME" && pwd`
+
+ cd "$saveddir"
+ # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+ [ -n "$M2_HOME" ] &&
+ M2_HOME=`cygpath --unix "$M2_HOME"`
+ [ -n "$JAVA_HOME" ] &&
+ JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+ [ -n "$CLASSPATH" ] &&
+ CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+ [ -n "$M2_HOME" ] &&
+ M2_HOME="`(cd "$M2_HOME"; pwd)`"
+ [ -n "$JAVA_HOME" ] &&
+ JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+ javaExecutable="`which javac`"
+ if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+ # readlink(1) is not available as standard on Solaris 10.
+ readLink=`which readlink`
+ if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+ if $darwin ; then
+ javaHome="`dirname \"$javaExecutable\"`"
+ javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+ else
+ javaExecutable="`readlink -f \"$javaExecutable\"`"
+ fi
+ javaHome="`dirname \"$javaExecutable\"`"
+ javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+ JAVA_HOME="$javaHome"
+ export JAVA_HOME
+ fi
+ fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+ if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD="$JAVA_HOME/jre/sh/java"
+ else
+ JAVACMD="$JAVA_HOME/bin/java"
+ fi
+ else
+ JAVACMD="`which java`"
+ fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+ echo "Error: JAVA_HOME is not defined correctly." >&2
+ echo " We cannot execute $JAVACMD" >&2
+ exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+ echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+ if [ -z "$1" ]
+ then
+ echo "Path not specified to find_maven_basedir"
+ return 1
+ fi
+
+ basedir="$1"
+ wdir="$1"
+ while [ "$wdir" != '/' ] ; do
+ if [ -d "$wdir"/.mvn ] ; then
+ basedir=$wdir
+ break
+ fi
+ # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+ if [ -d "${wdir}" ]; then
+ wdir=`cd "$wdir/.."; pwd`
+ fi
+ # end of workaround
+ done
+ echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+ if [ -f "$1" ]; then
+ echo "$(tr -s '\n' ' ' < "$1")"
+ fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+ exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Found .mvn/wrapper/maven-wrapper.jar"
+ fi
+else
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+ fi
+ if [ -n "$MVNW_REPOURL" ]; then
+ jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+ else
+ jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+ fi
+ while IFS="=" read key value; do
+ case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+ esac
+ done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Downloading from: $jarUrl"
+ fi
+ wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+ if $cygwin; then
+ wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+ fi
+
+ if command -v wget > /dev/null; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Found wget ... using wget"
+ fi
+ if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+ wget "$jarUrl" -O "$wrapperJarPath"
+ else
+ wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath"
+ fi
+ elif command -v curl > /dev/null; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Found curl ... using curl"
+ fi
+ if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+ curl -o "$wrapperJarPath" "$jarUrl" -f
+ else
+ curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+ fi
+
+ else
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Falling back to using Java to download"
+ fi
+ javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+ # For Cygwin, switch paths to Windows format before running javac
+ if $cygwin; then
+ javaClass=`cygpath --path --windows "$javaClass"`
+ fi
+ if [ -e "$javaClass" ]; then
+ if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo " - Compiling MavenWrapperDownloader.java ..."
+ fi
+ # Compiling the Java class
+ ("$JAVA_HOME/bin/javac" "$javaClass")
+ fi
+ if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+ # Running the downloader
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo " - Running MavenWrapperDownloader.java ..."
+ fi
+ ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+ fi
+ fi
+ fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+ echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+ [ -n "$M2_HOME" ] &&
+ M2_HOME=`cygpath --path --windows "$M2_HOME"`
+ [ -n "$JAVA_HOME" ] &&
+ JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+ [ -n "$CLASSPATH" ] &&
+ CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+ [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+ MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+ $MAVEN_OPTS \
+ -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+ "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+ ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/mvnw.cmd b/kafka-streams-samples/kafka-streams-metrics-demo/mvnw.cmd
new file mode 100644
index 0000000..c8d4337
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/mvnw.cmd
@@ -0,0 +1,182 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements. See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership. The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License. You may obtain a copy of the License at
+@REM
+@REM https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied. See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+
+FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+ IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+ if "%MVNW_VERBOSE%" == "true" (
+ echo Found %WRAPPER_JAR%
+ )
+) else (
+ if not "%MVNW_REPOURL%" == "" (
+ SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+ )
+ if "%MVNW_VERBOSE%" == "true" (
+ echo Couldn't find %WRAPPER_JAR%, downloading it ...
+ echo Downloading from: %DOWNLOAD_URL%
+ )
+
+ powershell -Command "&{"^
+ "$webclient = new-object System.Net.WebClient;"^
+ "if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+ "$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+ "}"^
+ "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+ "}"
+ if "%MVNW_VERBOSE%" == "true" (
+ echo Finished downloading %WRAPPER_JAR%
+ )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/pom.xml b/kafka-streams-samples/kafka-streams-metrics-demo/pom.xml
new file mode 100644
index 0000000..7b377be
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/pom.xml
@@ -0,0 +1,94 @@
+
+
+ 4.0.0
+
+ org.springframework.boot
+ spring-boot-starter-parent
+ 2.3.4.RELEASE
+
+
+ com.example
+ kafka-streams-metrics-demo
+ 0.0.1-SNAPSHOT
+ kafka-streams-metrics-demo
+ Demo project for Spring Boot
+
+
+ 11
+ Hoxton.SR8
+ 1.0.0
+
+
+
+
+ org.apache.kafka
+ kafka-streams
+
+
+ org.springframework.cloud
+ spring-cloud-stream
+
+
+ org.springframework.cloud
+ spring-cloud-stream-binder-kafka-streams
+
+
+
+ org.springframework.boot
+ spring-boot-starter-test
+ test
+
+
+ org.junit.vintage
+ junit-vintage-engine
+
+
+
+
+ org.springframework.cloud
+ spring-cloud-stream-test-support
+ test
+
+
+ io.micrometer
+ micrometer-registry-prometheus
+
+
+ io.micrometer.prometheus
+ prometheus-rsocket-spring
+ ${prometheus-rsocket.version}
+
+
+
+ org.springframework.boot
+ spring-boot-starter-actuator
+
+
+ org.springframework.boot
+ spring-boot-starter-web
+
+
+
+
+
+
+ org.springframework.cloud
+ spring-cloud-dependencies
+ ${spring-cloud.version}
+ pom
+ import
+
+
+
+
+
+
+
+ org.springframework.boot
+ spring-boot-maven-plugin
+
+
+
+
+
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/src/main/java/com/example/demo/KafkaStreamsMetricsDemoApplication.java b/kafka-streams-samples/kafka-streams-metrics-demo/src/main/java/com/example/demo/KafkaStreamsMetricsDemoApplication.java
new file mode 100644
index 0000000..de921a3
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/src/main/java/com/example/demo/KafkaStreamsMetricsDemoApplication.java
@@ -0,0 +1,27 @@
+package com.example.demo;
+
+import java.util.function.Function;
+
+import org.apache.kafka.streams.kstream.KStream;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class KafkaStreamsMetricsDemoApplication {
+
+ static int count = 0;
+
+ public static void main(String[] args) {
+ SpringApplication.run(KafkaStreamsMetricsDemoApplication.class, args);
+ }
+
+ @Bean
+ public Function, KStream> process() {
+ return input ->
+ input.peek((key,value)->
+ System.out.println("Key: " + key + "\t\tValue: " + value + "\t\tMessage Count: " + count++));
+ }
+
+}
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/src/main/java/com/example/demo/Producer.java b/kafka-streams-samples/kafka-streams-metrics-demo/src/main/java/com/example/demo/Producer.java
new file mode 100644
index 0000000..eafe7d9
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/src/main/java/com/example/demo/Producer.java
@@ -0,0 +1,37 @@
+package com.example.demo;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.common.serialization.StringSerializer;
+
+import org.springframework.kafka.core.DefaultKafkaProducerFactory;
+import org.springframework.kafka.core.KafkaTemplate;
+
+public class Producer {
+
+ public static void main(String... args) {
+
+ Map props = new HashMap<>();
+ props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
+ props.put(ProducerConfig.RETRIES_CONFIG, 0);
+ props.put(ProducerConfig.BATCH_SIZE_CONFIG, 16384);
+ props.put(ProducerConfig.LINGER_MS_CONFIG, 1);
+ props.put(ProducerConfig.BUFFER_MEMORY_CONFIG, 33554432);
+ props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+ props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+
+
+ DefaultKafkaProducerFactory pf = new DefaultKafkaProducerFactory<>(props);
+ KafkaTemplate template = new KafkaTemplate<>(pf, true);
+ template.setDefaultTopic("metrics-demo-in");
+
+ for (int i = 0; i < 5000; i++) {
+ template.sendDefault(i%12, "key:" + i, "value:" + i);
+ }
+
+
+
+ }
+}
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/src/main/resources/application.properties b/kafka-streams-samples/kafka-streams-metrics-demo/src/main/resources/application.properties
new file mode 100644
index 0000000..4556aea
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/src/main/resources/application.properties
@@ -0,0 +1,23 @@
+spring.cloud.stream.function.bindings.process-in-0=input
+spring.cloud.stream.function.bindings.process-out-0=output
+
+#Metrics related configurations
+management.endpoint.metrics.enabled=true
+management.endpoints.web.exposure.include=*
+management.endpoint.prometheus.enabled=true
+management.metrics.export.prometheus.enabled=true
+
+server.port=9000
+spring.kafka.bootstrap-servers=localhost:9092
+
+spring.cloud.stream.kafka.streams.binder.configuration.default.key.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
+spring.cloud.stream.kafka.streams.binder.configuration.default.value.serde=org.apache.kafka.common.serialization.Serdes$StringSerde
+
+spring.cloud.stream.kafka.streams.binder.auto-add-partitions=true
+spring.cloud.stream.kafka.streams.binder.min-partition-count=12
+
+spring.cloud.stream.kafka.streams.binder.configuration.num.stream.threads=4
+
+spring.cloud.stream.bindings.input.group=myGroup
+spring.cloud.stream.bindings.input.destination=metrics-demo-in
+spring.cloud.stream.bindings.output.destination=metrics-demo-out
diff --git a/kafka-streams-samples/kafka-streams-metrics-demo/src/test/java/com/example/demo/KafkaStreamsMetricsDemoApplicationTests.java b/kafka-streams-samples/kafka-streams-metrics-demo/src/test/java/com/example/demo/KafkaStreamsMetricsDemoApplicationTests.java
new file mode 100644
index 0000000..d541b72
--- /dev/null
+++ b/kafka-streams-samples/kafka-streams-metrics-demo/src/test/java/com/example/demo/KafkaStreamsMetricsDemoApplicationTests.java
@@ -0,0 +1,13 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class KafkaStreamsMetricsDemoApplicationTests {
+
+ @Test
+ void contextLoads() {
+ }
+
+}
diff --git a/kafka-streams-samples/pom.xml b/kafka-streams-samples/pom.xml
index d6fb709..c27ba17 100644
--- a/kafka-streams-samples/pom.xml
+++ b/kafka-streams-samples/pom.xml
@@ -21,6 +21,7 @@
kafka-streams-aggregate
kafka-streams-to-rabbitmq-message-channel
kafka-streams-inventory-count
+ kafka-streams-metrics-demo