Default exporter to agent365.svc.cloud.microsoft and remove useCustomDomainForObservability

[Copilot]

Aligns with Agent365-python#184. The exporter now defaults to https://agent365.svc.cloud.microsoft instead of discovering per-tenant IL endpoints via PowerPlatformApiDiscovery. The useCustomDomainForObservability toggle is removed since custom domain is now the only behavior.

Exporter changes (Agent365Exporter.ts)

• Removed PowerPlatformApiDiscovery — endpoint resolution is now: domain override → resolveAgent365Endpoint(clusterCategory)
• Updated URL paths to include tenantId: /observability/tenants/{tenantId}/agents/{agentId}/traces (S2S: /observabilityService/...)
• x-ms-tenant-id header is now always set

Removed useCustomDomainForObservability

• Removed getter from ObservabilityConfiguration
• Removed option from ObservabilityConfigurationOptions
• Removed utility function from exporter utils.ts
• Removed A365_OBSERVABILITY_USE_CUSTOM_DOMAIN env var references
• Removed all associated tests across 4 test files

Endpoint resolution (before → after)

# Before (3-way branch)
domainOverride → useCustomDomain? → PowerPlatformApiDiscovery per-tenant

# After
domainOverride → resolveAgent365Endpoint()

Docs

• Updated design.md, prd-configuration-provider.md, CLAUDE.md

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[Copilot]

Pull request overview

This PR updates the Agent365 OpenTelemetry span exporter to default to the Agent365 service endpoint (https://agent365.svc.cloud.microsoft) and removes PPAPI per-tenant discovery from export routing, aligning the Node SDK with the Python SDK behavior.

Changes:

• Remove PPAPI discovery flow from Agent365Exporter and always resolve via domain override → resolveAgent365Endpoint(clusterCategory).
• Update exporter URL paths to include tenantId for both non-S2S and S2S endpoints.
• Always set the x-ms-tenant-id request header and update unit tests accordingly.

Reviewed changes

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

File	Description
tests/observability/core/agent365-exporter.test.ts	Updates test expectations for the new base URL, tenant-in-path routes, and always-present x-ms-tenant-id header.
packages/agents-a365-observability/src/tracing/exporter/Agent365ExporterOptions.ts	Updates documentation for the S2S path to reflect the new tenant-in-path route.
packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts	Removes PPAPI discovery usage, updates endpoint routing and URL paths, and always sets x-ms-tenant-id.

[fpfp100]

Need to update the comment. ObservabilityConfigurationOptions.ts:50 still says observabilityDomainOverride is "Only used when useCustomDomainForObservability is true."