Enable OpenTelemetry tracing for agent framework activity sources

[Copilot]

The DevUI trace panel shows "Run devui --instrumentation and start a conversation." because agents were never instrumented and the agent framework's activity sources were never registered in the OpenTelemetry pipeline.

Changes

• Extensions.cs — Register the three agent framework activity sources so spans are captured and exported to Aspire dashboard / OTLP:

  tracing.AddSource(builder.Environment.ApplicationName)
      .AddSource("Experimental.Microsoft.Extensions.AI")  // LLM call spans
      .AddSource("Experimental.Microsoft.Agents.AI")      // agent run spans
      .AddSource("Microsoft.Agents.AI.Workflows")         // workflow execution spans

• AgentDelegateFactory.cs — Wrap agents with OpenTelemetryAgent in both modes (Single and LlmHandOff). This enables agent-level activity creation and automatically instruments LLM calls via OpenTelemetryChatClient internally:

  return new OpenTelemetryAgent(agent, sourceName: "Experimental.Microsoft.Agents.AI");

Note: The DevUI "Context Inspector" trace sub-panel requires the server to emit response.trace.completed SSE events, which is not yet implemented in Microsoft.Agents.AI.Hosting.OpenAI 1.0.0-alpha.260311.1. Traces are now fully visible in the Aspire dashboard and any OTLP-connected backend (e.g., Azure Monitor).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• learn.microsoft.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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