Opentelemetry Logs

[uptickmetachu]

Describe the enhancement

Add support for opentelemetry logs.

Traces are very helpful but it would be even better if we can also view the logs for a specific trace / module execution.

[yhakbar]

Hey @uptickmetachu ,

This seems like a very sensible ask. Do you mind providing more context in the form of design considerations? What would need to be done, in your mind, to have this enhancement delivered?

[uptickmetachu]

Terraform and opentofu both support json logging
https://opentofu.org/docs/internals/debugging/
https://developer.hashicorp.com/terraform/internals/debugging

What I envision is the terragrunt process captures the json log outputs from opentofu and terraform and inject extra tracing metadata such as:

• trace_parent
• service_name: terragrunt (or configurable via environment variable)
• span_attributes.terragrunt.module.path: Path of the terragrunt module relative to root path
• span_attributes.terraform.command: (plan | apply | info | etc)

The end goal would be able to see all the logs of a terragrunt apply-all or of individual runs.

A user should be able to find logs for all terraform applys to an individual module (for auditing / debugging)