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claude-code - 💡(How to fix) Fix OTEL per-request events not emitted on Microsoft Foundry (CLI, v2.1.126) [1 participants]

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anthropics/claude-code#55984•Fetched 2026-05-05 06:01:10
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Environment

  • Claude Code 2.1.126
  • macOS, terminal CLI (iTerm.app)
  • CLAUDE_CODE_USE_FOUNDRY=1 with ANTHROPIC_FOUNDRY_BASE_URL and ANTHROPIC_FOUNDRY_API_KEY set
  • CLAUDE_CODE_ENABLE_TELEMETRY=1, OTEL_*_EXPORTER=otlp, OTLP/HTTP endpoint configured and verified working

Steps to reproduce

  1. Configure CLAUDE_CODE_USE_FOUNDRY=1 + ANTHROPIC_FOUNDRY_BASE_URL + ANTHROPIC_FOUNDRY_API_KEY.
  2. Configure standard OTEL OTLP export to a working collector.
  3. Launch claude from a terminal and issue several prompts.
  4. Inspect the collector.

Expected

Per-request OTEL events emit on Foundry.

Actual

The following events did not emit during 2.5 hours of active Foundry use:

  • claude_code.api_request
  • claude_code.api_error
  • claude_code.cost.usage
  • claude_code.token.usage
  • claude_code.tool_decision
  • claude_code.tool_result
  • claude_code.skill_activated

The following events did emit normally:

  • claude_code.session.count
  • claude_code.active_time.total
  • claude_code.mcp_server_connection
  • claude_code.user_prompt
  • claude_code.hook_execution_complete

Comparison (same user, same OTEL config)

Window (UTC)Providerapi_requestcost.usagetoken.usage
07:12 – 07:44Anthropic API42yesyes
08:14 – 10:42Foundry000
10:43 – 10:59Anthropic API3yesyes

Removing the Foundry env vars restored the full event stream within minutes.

extent analysis

TL;DR

The issue is likely related to the integration with Foundry, and removing the Foundry environment variables restores the full event stream, suggesting a configuration or compatibility issue.

Guidance

  • Verify that the ANTHROPIC_FOUNDRY_BASE_URL and ANTHROPIC_FOUNDRY_API_KEY are correctly set and valid for the Foundry environment.
  • Check the Claude Code documentation for any specific requirements or limitations for using Foundry with OTEL OTLP export.
  • Investigate potential differences in how Claude Code handles API requests and events between the Anthropic API and Foundry providers.
  • Review the OTLP collector logs for any errors or warnings related to the Foundry events.

Example

No code snippet is provided as the issue seems to be related to configuration and environment variables.

Notes

The issue may be specific to the combination of Claude Code version 2.1.126, Foundry, and OTEL OTLP export. Further investigation is needed to determine the root cause.

Recommendation

Apply workaround: Remove the Foundry environment variables to restore the full event stream, and then re-add them one by one to identify the specific variable causing the issue. This will help to isolate the problem and potentially identify a configuration or compatibility issue.

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#api#ssr#installation#API versioning#request timeout

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claude-code - 💡(How to fix) Fix OTEL per-request events not emitted on Microsoft Foundry (CLI, v2.1.126) [1 participants]