[Observability] Truncate spans larger than 250 KB

[threddy]

No description provided.

[Copilot]

Pull Request Overview

This PR adds functionality to truncate large activity payloads before exporting them to the Agent365 endpoint. The main purpose is to prevent exporting activities that exceed 250 KB by truncating the largest attribute values first.

Key changes:

• Added a TruncateActivityToMaxSize method to Agent365ExporterCore that progressively truncates large activity attributes (largest first) until the serialized size is under 250 KB
• Integrated truncation logic into the export pipeline to automatically truncate activities before serialization
• Added comprehensive unit tests and an end-to-end integration test to validate the truncation behavior

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
Agent365ExporterCore.cs	Implements the core truncation logic with size checking, attribute truncation (largest-first), and logging; integrates truncation into the export batch pipeline
Agent365ExporterTests.cs	Adds four unit tests covering scenarios: activities under limit, single large key truncation, multiple key truncation, and key size logging; removes unused using statement
Agent365ExporterE2ETests.cs	Adds an integration test that creates a 300KB file payload and validates that nested scopes correctly truncate the large tool arguments while preserving smaller attributes

Comments suppressed due to low confidence (1)

src/Tests/Microsoft.Agents.A365.Observability.Runtime.Tests/Tracing/Exporters/Agent365ExporterTests.cs:1

• Missing required Microsoft copyright header. Please add the following header at the top of the file before any using statements:\n\ncsharp\n// Copyright (c) Microsoft Corporation.\n// Licensed under the MIT License.\n

using FluentAssertions;

[Copilot]

Pull Request Overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.