Adding restart reason

[RohitRanjanMS]

Including the restart reason in the logs will provide valuable context during troubleshooting and root cause analysis.

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

Additional information

Additional PR information

[brettsam]

just one minor comment

[Copilot]

Pull Request Overview

This pull request adds restart reason logging to provide better troubleshooting context when host restarts occur. The change modifies the RestartHostAsync method across the codebase to accept a reason parameter that gets logged and included in restart events.

• Adds a required reason parameter to IScriptHostManager.RestartHostAsync method
• Updates all calls to RestartHostAsync throughout the codebase to include descriptive restart reasons
• Modifies HostRestartEvent to include the restart reason and updates related logging

Reviewed Changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/WebJobs.Script/Host/IScriptHostManager.cs	Adds reason parameter to RestartHostAsync interface method
src/WebJobs.Script/Eventing/Host/HostRestartEvent.cs	Adds Reason property to HostRestartEvent class
src/WebJobs.Script.WebHost/WebJobsScriptHostService.cs	Implements reason parameter and logs restart reason
src/WebJobs.Script.WebHost/Diagnostics/Extensions/ScriptHostServiceLoggerExtension.cs	Updates logging extension to include restart reason
src/WebJobs.Script.WebHost/FileMonitoringService.cs	Updates file monitoring restart calls with descriptive reasons
src/WebJobs.Script.WebHost/Controllers/HostController.cs	Adds restart reasons for API-triggered restarts
Multiple test files	Updates test mocks and verifications to include reason parameter
release_notes.md	Documents the new feature