:heavy_plus_sign: OpenTelemetry Demo with Elastic Observability

The following guide describes how to setup the OpenTelemetry demo with Elastic Observability using Docker compose or Kubernetes. This fork introduces several changes to the agents used in the demo:

• The Java agent within the Ad, the Fraud Detection and the Kafka services have been replaced with the Elastic distribution of the OpenTelemetry Java Agent. You can find more information about the Elastic distribution in this blog post.
• The .NET agent within the Cart service has been replaced with the Elastic distribution of the OpenTelemetry .NET Agent. You can find more information about the Elastic distribution in this blog post.
• The Elastic distribution of the OpenTelemetry Node.js Agent has replaced the OpenTelemetry Node.js agent in the Payment service. Additional details about the Elastic distribution are available in this blog post.
• The Elastic distribution for OpenTelemetry Python has replaced the OpenTelemetry Python agent in the Recommendation service. Additional details about the Elastic distribution are available in this blog post.

Additionally, the OpenTelemetry Contrib collector has also been changed to the Elastic OpenTelemetry Collector distribution. This ensures a more integrated and optimized experience with Elastic Observability.

Docker compose

1. Start a free trial on Elastic Cloud and copy the endpoint and secretToken from the Elastic APM setup instructions in your Kibana.
2. Open the file src/otelcollector/otelcol-elastic-config-extras.yaml in an editor and replace the following two placeholders:
   • YOUR_APM_ENDPOINT_WITHOUT_HTTPS_PREFIX: your Elastic APM endpoint (without https:// prefix) that must also include the port (example: 1234567.apm.us-west2.gcp.elastic-cloud.com:443).
   • YOUR_APM_SECRET_TOKEN: your Elastic APM secret token.
3. Start the demo with the following command from the repository's root directory:

   make start

Kubernetes

Prerequisites:

• Create a Kubernetes cluster. There are no specific requirements, so you can create a local one, or use a managed Kubernetes cluster, such as GKE, EKS, or AKS.
• Set up kubectl.
• Set up Helm.

Start the Demo

1. Setup Elastic Observability on Elastic Cloud.
2. Create a secret in Kubernetes with the following command.

   kubectl create secret generic elastic-secret \
    --from-literal=elastic_apm_endpoint='YOUR_APM_ENDPOINT_WITHOUT_HTTPS_PREFIX' \
    --from-literal=elastic_apm_secret_token='YOUR_APM_SECRET_TOKEN'

   Don't forget to replace

   • YOUR_APM_ENDPOINT_WITHOUT_HTTPS_PREFIX: your Elastic APM endpoint (without https:// prefix) that must also include the port (example: 1234567.apm.us-west2.gcp.elastic-cloud.com:443).
   • YOUR_APM_SECRET_TOKEN: your Elastic APM secret token

3. Execute the following commands to deploy the OpenTelemetry demo to your Kubernetes cluster:

   # clone this repository
   git clone https://github.com/elastic/opentelemetry-demo
   
   # switch to the kubernetes/elastic-helm directory
   cd kubernetes/elastic-helm
   
   # !(when running it for the first time) add the open-telemetry Helm repostiroy
   helm repo add open-telemetry https://open-telemetry.github.io/opentelemetry-helm-charts
   
   # !(when an older helm open-telemetry repo exists) update the open-telemetry helm repo
   helm repo update open-telemetry
   
   # deploy the demo through helm install
   helm install -f deployment.yaml my-otel-demo open-telemetry/opentelemetry-demo

Kubernetes monitoring

This demo already enables cluster level metrics collection with clusterMetrics and Kubernetes events collection with kubernetesEvents.

In order to add Node level metrics collection we can run an additional Otel collector Daemonset with the following:

1. Create a secret in Kubernetes with the following command.

   kubectl create secret generic elastic-secret-ds \
    --from-literal=elastic_endpoint='YOUR_ELASTICSEARCH_ENDPOINT' \
    --from-literal=elastic_api_key='YOUR_ELASTICSEARCH_API_KEY'

   Don't forget to replace

   • YOUR_ELASTICSEARCH_ENDPOINT: your Elasticsearch endpoint (with https:// prefix example: https://1234567.us-west2.gcp.elastic-cloud.com:443).
   • YOUR_ELASTICSEARCH_API_KEY: your Elasticsearch API Key

2. Execute the following command to deploy the OpenTelemetry Collector to your Kubernetes cluster, in the same directory kubernetes/elastic-helm in this repository.

# deploy the Elastic OpenTelemetry collector distribution through helm install
helm install otel-daemonset open-telemetry/opentelemetry-collector --values daemonset.yaml

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