Monit process otel-collector is replaced with opamp-supervisor proccess in EAR 10.4.x

Products

• VMware Tanzu Platform - Cloud Foundry

Issue/Introduction

In TPCF/EAR versions prior to 10.4, the otel-collector runs as a monit process on the VMs in the CF deployment.

Process 'otel-collector'            running

 

In 10.4 however, this has been replaced with the opamp-supervisor:

Process 'opamp-supervisor'          running

Environment

 TPCF/EAR 10.4

Resolution

Looking at the config files for the opamp supervisor under /var/vcap/jobs/opamp-supervisor/config/opamp-supervisor.yml shows that it points to the otel-collector config/executable:

agent:
  # Path to the collector binary that supervisor will manage
  executable: /var/vcap/packages/otel-collector/otel-collector
  # Using config_files so the supervisor can merge its auto-generated
  # OpAMP extension configuration into the collector config.
  config_files:
    - $OWN_TELEMETRY_CONFIG
    - $REMOTE_CONFIG
    - /var/vcap/jobs/otel-collector/config/config.yml
    - $OPAMP_EXTENSION_CONFIG
  bootstrap_timeout: 30s
  env:
    GOMEMLIMIT: "614MiB"

 

Also, running ps -ef | grep collector shows the otel-collector executable running with relation to opamp-supervisor.

root      176400   62827  4 May28 ?        1-18:19:24 /var/vcap/packages/otel-collector/otel-collector --config /var/vcap/jobs/opamp-supervisor/store/effective.yaml --feature-gates service.AllowNoPipelines

 

So the opamp-supervisor is running and managing the otel collector in 10.4.2. More info on the opamp-supervisor can be found here:

https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/cmd/opampsupervisor/specification/README.md

The logs for the otel-collector itself can now be found in /var/vcap/jobs/opamp-supervisor/store/agent.log on each VM. However, there is currently no logrotation implemented on this file. A fix for this is in progress, and more details can be found here:

https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/50376

https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/50377