Close camunda-community-hub#83: provide camunda metrics

README.md

@@ -45,6 +45,7 @@ Micronaut + Camunda = :heart:
   * [Transaction Management](#transaction-management)
   * [Process Tests](#process-tests)
   * [Docker](#docker)
+  * [Camunda Metrics](#camunda-metrics) 
   * [Pitfalls](#pitfalls)
 * [Releases](#releases)
 * [Contact](#contact)
@@ -636,6 +637,61 @@ Run the Docker image:
 
 `docker run -p 8080:8080 <IMAGE>`
 
+## Camunda Metrics
+
+To export Camunda Metrics via micronaut-micrometer you need to add the dependency and enable it __explicitly__ in your `application.yml`.
+
+We currently support all Camunda Build-In Metrics. See [Process Engine / Metrics](https://docs.camunda.org/manual/latest/user-guide/process-engine/metrics/)
+
+<details>
+<summary>Click to show Gradle dependencies</summary>
+
+```groovy
+implementation("io.micronaut.micrometer:micronaut-micrometer-core")
+
+// optional enable http endpoint for metrics
+implementation("io.micronaut:micronaut-management")
+```
+</details>
+
+<details>
+<summary>Click to show Maven dependencies</summary>
+
+```xml
+<dependency>
+  <groupId>io.micronaut.micrometer</groupId>
+  <artifactId>micronaut-micrometer-core</artifactId>
+</dependency>
+
+<!-- optional enable http endpoint for metrics -->
+<dependency>
+  <groupId>io.micronaut</groupId>
+  <artifactId>micronaut-management</artifactId>
+</dependency>
+```
+</details>
+
+<details>
+<summary>Click to show configuration</summary>
+
+```yaml
+micronaut:
+  metrics:
+    binders:
+      camunda:
+        bpmnExecution:
+          enabled: true
+        dmnExecution:
+          enabled: true
+        jobExecutor:
+          enabled: true
+        historyCleanUp:
+          enabled: true
+```
+</details>
+
+One note about performance: Take into consideration the execution times of your metric collectors. Each metric collector is run as a standalone timer thread execution, but the more collectors you add, and the large the data processing and/or database query time/load the collector uses per execution, it can create large performance impacts on the engine.
+
 ## Pitfalls
 
 ### No version information in Fat/Uber/Shadow JAR

micronaut-camunda-bpm-example/README.md

@@ -59,3 +59,5 @@ the data source's URL:
 `datasources.default.url: jdbc:h2:file:~/micronautdb;DB_CLOSE_ON_EXIT=FALSE`
 
 To reset the database simply delete the `micronautdb*` files in your home directory.
+
+## Monitoring

micronaut-camunda-bpm-example/build.gradle

@@ -15,6 +15,18 @@ micronaut {
 
 dependencies {
     implementation(project(":micronaut-camunda-bpm-feature"))
+
+    // imported to enable http endpoint for metrics
+    implementation("io.micronaut:micronaut-management")
+
+
+    // imported to activate metrics
+    // comes also with micronaut-micrometer-registry-prometheus, it's here just to make the example more verbose
+    implementation("io.micronaut.micrometer:micronaut-micrometer-core")
+
+    // just added to export metrics to prometheus, start it via docker-compose
+    implementation("io.micronaut.micrometer:micronaut-micrometer-registry-prometheus")
+
     runtimeOnly("com.h2database:h2")
     runtimeOnly("ch.qos.logback:logback-classic")
 

micronaut-camunda-bpm-example/docker-compose.yml

@@ -0,0 +1,23 @@
+version: '3.8'
+services:
+
+  prometheus:
+    image: prom/prometheus:latest
+    volumes:
+      - ./src/test/resources/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml
+    ports:
+      - '9090:9090'
+    network_mode: host
+
+  grafana:
+    image: grafana/grafana:latest
+    environment:
+      - GF_SECURITY_ADMIN_PASSWORD=admin
+    depends_on:
+      - prometheus
+    ports:
+      - "3000:3000"
+    network_mode: host
+    user: $UID:$GID
+    volumes:
+      - ./src/test/resources/grafana/:/etc/grafana/provisioning/

micronaut-camunda-bpm-example/src/main/resources/application.yml

@@ -1,6 +1,28 @@
 micronaut:
   application:
     name: micronaut-camunda-example
+  metrics:
+    export:
+      logging:
+        step: PT1M
+        enabled: true
+      prometheus:
+        enabled: true
+        step: PT1M
+        descriptions: true
+    binders:
+      camunda:
+        bpmnExecution:
+          enabled: true
+        dmnExecution:
+          enabled: true
+        jobExecutor:
+          enabled: true
+        historyCleanUp:
+          enabled: true
+endpoints:
+  prometheus:
+    sensitive: false
 camunda:
   admin-user:
     id: admin