opentelemetry: send logs

[v1v]

SUMMARY

Enable shipping logs with OpenTelemetry in order to allow logs correlations with traces.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

opentelemetry

ADDITIONAL INFORMATION

More context with some questions :)

I decided to call self._dump_results in each callback function and store the object in the TaskData. I don't know if this could be problematic and it's worthy to use a different approach, like calling _dump_results when needed. In fact, that's how the logstash and some other plugins work.

As far as I see the output from self._dump_results looks a good candidate since the data structure is ansible based, and therefore there is no need to reinvent any new format but use the one from Ansible core.

From the implementation details I used add_event since Logs/Events are the same in OpenTelemetry -> event and logs with OTEL.

Given

---
- name: MyPlabook
  hosts: localhost
  connection: local

  roles:
  - role: myrole
  tasks:
  - name: MyTask2
    uri:
      url: https://www.elastic.co
      return_content: yes
    register: webpage

And if I run without the logs:

ANSIBLE_OPENTELEMETRY_DISABLE_LOGS=true OTEL_SERVICE_NAME=ansible-logs \
OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317 \
OTEL_EXPORTER_OTLP_INSECURE=true \
ansible-playbook -i hosts my-playbook.yml

Produces

While if I run with the logs:

OTEL_SERVICE_NAME=ansible-logs \
OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317 \
OTEL_EXPORTER_OTLP_INSECURE=true \
ansible-playbook -i hosts my-playbook.yml

produces

[felixfontein]

(This also needs a changelog fragment before leaving draft status.)

[v1v]

I'll put this implementation on-hold since OTEL span events might eventually become deprecated, and OTEL logs will be the long term approach to put in place, I'll work on this

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