[BUG]

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The OTEL_RESOURCE_ATTRIBUTES environment variable is not being applied to metrics export

when we set OTEL_RESOURCE_ATTRIBUTES="user.staff_no=100000" in ~/.claude/settings.json, open telemetry does not add this additional info to the metrics.

this issue is mentioned in #16537 which was closed.

What Should Happen?

when we set OTEL_RESOURCE_ATTRIBUTES="user.staff_no=100000". otel should add label " user.staff_no: 100000 " to the metrics.

Error Messages/Logs

Steps to Reproduce

Edit ~/.claude/settings.json:
{
"env": {
"CLAUDE_CODE_ENABLE_TELEMETRY": "1",
"OTEL_RESOURCE_ATTRIBUTES": "user.staff_no=100000",
"OTEL_LOGS_EXPORTER": "otlp,console",
"OTEL_EXPORTER_OTLP_LOGS_PROTOCOL": "http/protobuf",
"OTEL_EXPORTER_OTLP_LOGS_ENDPOINT": "<some endpoint>",
"OTEL_EXPORTER_OTLP_HEADERS": "<some header>",
"OTEL_METRICS_EXPORTER": "otlp,console",
"OTEL_EXPORTER_OTLP_METRICS_PROTOCOL": "http/protobuf",
"OTEL_EXPORTER_OTLP_METRICS_ENDPOINT": "<some endpoint>"
}
}
Restart Claude Code
Observe console output for both events and metrics
Notice that user.staff_no is missing in metrics' dataPoints.attributes

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.63

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_