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Apache Camel - Context view

Apache Camel 3 & 4 - Statistics on Camel Context level

Performance oriented monitoring on Apache Camel 3 & 4 deployments. Works ideally on Kubernetes deployments. Based on Prometheus datasource scraping metrics coming from the micrometer framework. Focuses on analyzing Camel Context, Route & Processor execution times and throughput.

Min required versions :

  • Apache Camel 3.21+
  • Apache Camel 4.0.0-M3+

Mixin install commands

jb init

jb install https://github.com/alainpham/app-archetypes/camel-monitoring/camel-dashboards/

Application instrumentation

Micrometer is supported on Spring Boot, Quarkus and Camel K flavors. See the project archetypes quarkus-camel and spring-boot-camel here to have ready to use instrumented Apache Camel projects.

https://github.com/alainpham/app-archetypes

If you don’t want to use the archetype, the instrumentation of the application is as simple very simple like described in the following paragraphs.

For Quarkus

pom.xml

xml 
<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-registry-prometheus</artifactId>
</dependency>
<dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-micrometer</artifactId>
</dependency>

application.properties

quarkus.camel.metrics.enable-message-history=true

For Spring Boot

pom.xml

xml 
<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-registry-prometheus</artifactId>
    </dependency>
<dependency>
    <groupId>org.apache.camel.springboot</groupId>
    <artifactId>camel-micrometer-starter</artifactId>
</dependency>

Configuration class

Create a configuration class in your spring boot project.

java 
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.micrometer.eventnotifier.MicrometerExchangeEventNotifier;
import org.apache.camel.component.micrometer.eventnotifier.MicrometerRouteEventNotifier;
import org.apache.camel.component.micrometer.messagehistory.MicrometerMessageHistoryFactory;
import org.apache.camel.component.micrometer.routepolicy.MicrometerRoutePolicyFactory;
import org.springframework.stereotype.Component;

@Component
public class Configurator extends RouteBuilder {
	@Override
	public void configure() throws Exception {
		getContext().addRoutePolicyFactory(new MicrometerRoutePolicyFactory());
		getContext().setMessageHistoryFactory(new MicrometerMessageHistoryFactory());
		getCamelContext().getManagementStrategy().addEventNotifier(new MicrometerExchangeEventNotifier());
		getCamelContext().getManagementStrategy().addEventNotifier(new MicrometerRouteEventNotifier());
	}
}

Prometheus scraping

Dashboard is designed for metrics scraped from kubernetes deployment

This is the scrape config to be used as an example

yaml 
# inspired by the prometheus kubernetes helm chart
global:
  scrape_interval: 15s
  external_labels:
    cluster: cloud
scrape_configs:
  - job_name: integrations/kubernetes/applications
    bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
    honor_labels: true
    kubernetes_sd_configs:
      - role: pod
        namespaces:
          own_namespace: true
    relabel_configs:
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
        action: keep
        regex: true
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape_slow]
        action: drop
        regex: true
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scheme]
        action: replace
        regex: (https?)
        target_label: __scheme__
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
        action: replace
        target_label: __metrics_path__
        regex: (.+)
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_port, __meta_kubernetes_pod_ip]
        action: replace
        regex: (\d+);(([A-Fa-f0-9]{1,4}::?){1,7}[A-Fa-f0-9]{1,4})
        replacement: '[$2]:$1'
        target_label: __address__
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_port, __meta_kubernetes_pod_ip]
        action: replace
        regex: (\d+);((([0-9]+?)(\.|$)){4})
        replacement: $2:$1
        target_label: __address__
      - action: labelmap
        regex: __meta_kubernetes_pod_annotation_prometheus_io_param_(.+)
        replacement: __param_$1
      - action: labelmap
        regex: __meta_kubernetes_pod_label_(.+)
      - source_labels: [__meta_kubernetes_namespace]
        action: replace
        target_label: namespace
      - source_labels: [__meta_kubernetes_pod_node_name]
        action: replace
        target_label: node
      - source_labels: [__meta_kubernetes_pod_name]
        action: replace
        target_label: pod
      - source_labels: [__meta_kubernetes_pod_phase]
        regex: Pending|Succeeded|Failed|Completed
        action: drop

To scrape instances that are not deployed in kubernetes you can simulate kubernetes labels with the following prometheus configs.

Kubernetes specific labels that need to be simulated are

  • app_kubernetes_io_part_of
  • app_kubernetes_io_name
  • app_kubernetes_io_component
  • app_kubernetes_io_instance
  • app_kubernetes_io_version
  • cluster
  • node
  • pod
  • namespace
yaml 
global:
  scrape_interval: 15s
  evaluation_interval: 15s
scrape_configs:
  - job_name: "camel-dev"
    metrics_path: /q/metrics
    relabel_configs:
      - target_label: app_kubernetes_io_part_of
        replacement: camel-app
      - target_label: app_kubernetes_io_name
        replacement: camel-app
      - target_label: app_kubernetes_io_component
        replacement: camel-app
      - target_label: app_kubernetes_io_instance
        replacement: camel-app-master
      - target_label: app_kubernetes_io_version
        replacement: "1.0.0"
      - target_label: cluster
        replacement: cloud
      - target_label: node
        replacement: worker-01
      - target_label: pod
        replacement: camel-app-1
      - target_label: namespace
        replacement: camel-ns
    static_configs:
      - targets:
          - "localhost:8090"

Video tutorial material

Watch a demo video here : https://www.youtube.com/watch?v=0LDgv1nIk-Y

or here https://odysee.com/@alainpham:8/apache-camel-monitoring-prometheus-grafana:c

Here is the git repo for setting up the demo : https://github.com/alainpham/app-archetypes

Feel free to asks questions and send me feedback on LinkedIn or Twitter

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