feat(otel): make otel logging level configurable

[codefromthecrypt]

Summary

Make the OTLP log filter level configurable instead of hardcoded to WARN. Follows the Rust community pattern: RUST_LOG → OTEL_LOG_LEVEL → default info.

Type of Change

• Feature

AI Assistance

• This PR was created or reviewed with AI assistance

Testing

No exporter — no OTel output in console:

$ ./target/release/goose run -t "hello"
● new session · openai gpt-5-nano
    20260217_5 · /Users/codefromthecrypt/oss/goose-goosed
Hello! Happy to help with Goose.

Default (info) — shows INFO log records:

$ OTEL_LOGS_EXPORTER=console ./target/release/goose run -t "hello"
Logs
Resource
	 ->  service.name=String(Static("goose"))
	 ->  service.namespace=String(Static("goose"))
	 ->  telemetry.sdk.language=String(Static("rust"))
	 ->  service.version=String(Static("1.24.0"))
	 ->  telemetry.sdk.version=String(Static("0.31.0"))
	 ->  telemetry.sdk.name=String(Static("opentelemetry"))
Log #0
	 Instrumentation Scope: InstrumentationScope { name: "", version: None, schema_url: None, attributes: [] }
	 EventName: "event crates/goose-cli/src/cli.rs:1439"
	 Target (Scope): "goose_cli::cli"
	 Observed Timestamp: 2026-02-17 15:03:21.868813
	 SeverityText: "INFO"
	 SeverityNumber: Info
	 Body: String(Owned("CLI command executed"))
	 Attributes:
		 ->  counter.goose.cli_commands: Int(1)
		 ->  command: String(Owned("run"))

WARN only — no INFO log records in output:

$ OTEL_LOG_LEVEL=warn OTEL_LOGS_EXPORTER=console ./target/release/goose run -t "hello"
● new session · openai gpt-5-nano
    20260217_4 · /Users/codefromthecrypt/oss/goose-goosed
Hello! Nice to meet you. I'm ready to help with the goose-goosed repo.

Related Issues

Continues ENV support from #7144

[Copilot]

Pull request overview

This PR makes the OTLP log filter level configurable (instead of hardcoded to WARN) by resolving a level from environment variables with precedence RUST_LOG → OTEL_LOG_LEVEL → default info.

Changes:

• Added parse_level() + otel_logs_level() to resolve an OTLP log level from env vars.
• Updated the OTLP logs filter to use the resolved level.
• Extended the OTLP tests and generalized env cleanup to include OTEL_LOG_LEVEL and override keys.

[codefromthecrypt]

rejigged this so that otel tests that now interact with RUST_LOG can be tested without conflating that generally with an otel env