Bael 5895 gatling monitoring (#18393)

* [BAEL-5895] Add docker-compose with grafana and prometheus

* [BAEL-5895] Containerized the service

* Added the new endpoints to use in gatling tests
* Added gatling simulations for the new endpoints

* [BAEL-5895] Introduced influxDB

* Configured gatling to expose metrics to influx-db

* [BAEL-5895] Added all services in docker-compose

* Added some default dashboards and datasources for grafana
* fix indentation in java classes

* [BAEL-5895] Refactor Gatling Simulations to make them more readable for the article

Author: bpstelios10

testing-modules/gatling-java/Dockerfile

@@ -0,0 +1,6 @@
+FROM openjdk:17-jdk-slim
+
+COPY target/gatling-java.jar app.jar
+ENTRYPOINT ["java","-jar","/app.jar"]
+
+EXPOSE 8080

testing-modules/gatling-java/README.md

@@ -1,7 +1,10 @@
 ### Relevant Articles:
+
 - [Load Testing Rest Endpoint Using Gatling](https://www.baeldung.com/gatling-load-testing-rest-endpoint)
 - [How to Display a Full HTTP Response Body With Gatling](https://www.baeldung.com/java-gatling-show-response-body)
 
-
 ### Running a simualtion
- To run the simulation from command prompt use mvn gatling:test
+
+To run the simulations from command prompt use `mvn gatling:test`. This will trigger all 3 simulations: EmployeeRegistrationSimulation, FetchSinglePostSimulation and FetchSinglePostSimulationLog.
+
+For executing any other simulations, use `mvn gatling:test -Dgatling.simulationClass=org.baeldung.FastEndpointSimulation`

testing-modules/gatling-java/docker-compose.yml

@@ -0,0 +1,47 @@
+version: '3'
+
+services:
+  influxdb:
+    build: influxDb
+    container_name: influxdb
+    ports:
+      - '8086:8086'
+      - '2003:2003'
+    environment:
+      - INFLUX_USER=admin
+      - INFLUX_PASSWORD=admin
+      - INFLUX_DB=influx
+    volumes:
+      - influxdb_data:/var/lib/influxdb
+
+  prometheus:
+    build: prometheus
+    container_name: prometheus
+    depends_on:
+      - service
+    ports:
+      - "9090:9090"
+    volumes:
+      - prometheus_data:/prometheus
+
+  grafana:
+    build: grafana
+    container_name: grafana
+    ports:
+      - "3000:3000"
+    environment:
+      - GF_SECURITY_ADMIN_USER=admin
+      - GF_SECURITY_ADMIN_PASSWORD=admin
+    volumes:
+      - grafana_data:/var/lib/grafana
+
+  service:
+    build: .
+    container_name: service
+    ports:
+      - "8080:8080"
+
+volumes:
+  influxdb_data: {}
+  grafana_data: {}
+  prometheus_data: {}

testing-modules/gatling-java/grafana/Dockerfile

@@ -0,0 +1,6 @@
+FROM grafana/grafana:10.2.2
+
+COPY provisioning/ /etc/grafana/provisioning/
+COPY dashboards/ /etc/grafana/provisioning/dashboards
+
+EXPOSE 3000:3000