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.NET: Add hosted agent observability sample - #5660
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Roger Barreto (rogerbarreto) merged 2 commits intoMay 6, 2026
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Mirrors the Python sample added in microsoft#5608 for Foundry hosted agents. The .NET hosting library already wires OpenTelemetry automatically via Microsoft.Agents.AI.Foundry.Hosting (ApplyOpenTelemetry) plus Azure.AI.AgentServer.Core's AddAgentHostTelemetry, so no framework changes are needed. The sample is documentation plus a runnable artifact that produces an interesting span tree (invoke_agent / agent_invoke / chat / execute_tool). Adds Hosted-Observability under FoundryHostedAgents/responses with two small tools (GetCurrentLocation, GetWeather), agent.yaml / agent.manifest.yaml declaring OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT (the .NET equivalent of Python's ENABLE_SENSITIVE_DATA), Dockerfile + Dockerfile.contributor, .env.example and README explaining the .NET vs Python defaults. Project added to agent-framework-dotnet.slnx.
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Pull request overview
Note
Copilot was unable to run its full agentic suite in this review.
Adds a .NET “Hosted-Observability” sample under Foundry hosted agents to mirror the Python observability sample and demonstrate OpenTelemetry span emission end-to-end.
Changes:
- Introduces a new hosted agent sample with two demo tools to generate an observable span tree.
- Adds Foundry agent configuration/manifest files enabling GenAI message content capture via OTel env var.
- Registers the new sample project in
agent-framework-dotnet.slnx.
Reviewed changes
Copilot reviewed 9 out of 9 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/agent.yaml | Defines hosted agent container config and env var for sensitive span content capture |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/agent.manifest.yaml | Adds manifest metadata and template configuration for deployment |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/README.md | Documents how instrumentation works in .NET and expected spans |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/Program.cs | Implements the sample agent, tools, and local credential behavior |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/HostedObservability.csproj | Adds the sample project targeting net10.0 with required references |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/Dockerfile.contributor | Contributor Docker workflow for ProjectReference builds |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/Dockerfile | End-user Docker workflow building via SDK image |
| dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/.env.example | Documents required env vars for local runs and optional AI telemetry |
| dotnet/agent-framework-dotnet.slnx | Includes the new sample project in the solution explorer hierarchy |
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Roger Barreto (rogerbarreto)had a problem deploying
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Roger Barreto (rogerbarreto)had a problem deploying
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Jacob Alber (lokitoth)
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May 5, 2026
Roger Barreto (rogerbarreto)temporarily deployed
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Roger Barreto (rogerbarreto)temporarily deployed
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Peter Ibekwe (peibekwe)
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Motivation and Context
PR #5608 added a Foundry hosted agent observability sample for Python. There was no equivalent under
dotnet/samples/04-hosting/FoundryHostedAgents/responses/. This adds parity coverage so .NET users discover the same scenario.Description
New sample
Hosted-Observabilitymirroring the layout ofHosted-LocalToolswith two demo tools (GetCurrentLocation,GetWeather) so a request produces a span tree covering agent invocation, the chat call, and tool execution.Key behavioural differences vs the Python sample called out in the README:
ENABLE_INSTRUMENTATIONMicrosoft.Agents.AI.Foundry.Hosting.ServiceCollectionExtensions.ApplyOpenTelemetryautomatically wraps the agent andAzure.AI.AgentServer.Core.AddAgentHostTelemetry()wires the OTLP exporter.ENABLE_SENSITIVE_DATA=trueOTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT=true(read byOpenTelemetryAgent.EnableSensitiveData).APPLICATIONINSIGHTS_CONNECTION_STRINGinjected by FoundrySo no framework changes were needed. The PR is samples plus a slnx entry only.
Files added under
dotnet/samples/04-hosting/FoundryHostedAgents/responses/Hosted-Observability/:HostedObservability.csprojProgram.csagent.yamlandagent.manifest.yamldeclaringOTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENTDockerfileandDockerfile.contributor.env.exampleREADME.mdexplaining the .NET vs Python differences and the expected span treeagent-framework-dotnet.slnxupdated to register the new project.Verification
dotnet build dotnet/agent-framework-dotnet.slnx --tl:off: 0 warnings, 0 errors.mcr.microsoft.com/dotnet/sdk:10.0,--verify-no-changes --verbosity diagnostic) on the new csproj: clean.Contribution Checklist