Otel Logs Exporter

otel-logs experiment exports logs to OpenTelemetry

Terragrunt previously emitted only traces and metrics, so there was no way to ship its log output to an OpenTelemetry backend or correlate log lines with the spans of a failed run.

Enable the new otel-logs experiment to add an OpenTelemetry logs signal, configured with TG_TELEMETRY_LOGS_EXPORTER:

• none - no log exporting, the default.
• console - write log records to the console as JSON.
• otlpHttp - export logs to an OpenTelemetry collector over HTTP.
• otlpGrpc - export logs to an OpenTelemetry collector over gRPC.

TG_TELEMETRY_LOGS_EXPORTER=otlpHttp terragrunt run --all --experiment otel-logs -- apply

The OTLP exporters read the endpoint from the standard OTEL_EXPORTER_OTLP_ENDPOINT environment variable. Set TG_TELEMETRY_LOGS_EXPORTER_INSECURE_ENDPOINT=true to disable TLS when collecting locally. Records emitted while a span is active carry its trace and span IDs, so a failed unit's logs link to its span in the backend. Without the experiment enabled, the logs exporter stays inert regardless of TG_TELEMETRY_LOGS_EXPORTER.