Add option to use custom domain for A365 service

[fpfp100]

Introduce option to use custom A365 service for SDK. Use environment variable A365_OBSERVABILITY_USE_CUSTOM_DOMAIN. When it is false, default to use PPAPI gateway endpoint per-tenant.

[Copilot]

Pull request overview

This PR adds a configurable option to route Agent365 observability exports to a custom domain, controlled by the environment variable A365_OBSERVABILITY_USE_CUSTOM_DOMAIN. When disabled, the exporter falls back to per-tenant PPAPI gateway discovery.

• Introduces useCustomDomainForObservability and resolveAgent365Endpoint helpers.
• Updates Agent365Exporter to conditionally use a custom domain and header behavior based on the flag.
• Adds tests that validate URL selection, headers, and token usage under both custom-domain and default discovery paths.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
tests/observability/core/agent365-exporter.test.ts	Adds parameterized tests for custom-domain and default discovery export paths, asserting URL and header behavior and authorization.
packages/agents-a365-observability/src/tracing/util.ts	Adds helpers to read the custom-domain flag and resolve the Agent365 endpoint per cluster.
packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts	Modifies export flow to use custom domain when enabled and adjusts headers; retains default discovery otherwise.

Comments suppressed due to low confidence (1)

packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts:149

• Unused variable isProd.

    const isProd = String(this.options.clusterCategory || '').toLowerCase() === 'prod';

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

Comments suppressed due to low confidence (1)

tests/observability/core/agent365-exporter.test.ts:108

• This string is not a template literal, but appears to reference the variable agentId.

    { cluster: 'prod', customDomainEnabled: false, expectedCustomDomainUrl: 'https://${endpoint}/maven/agent365/agents/${agentId}/traces?api-version=1', token: 'tok-prod-disabled' }

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

[Copilot]

Pull request overview

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