[Copilot]

The AI Gateway currently provisions a legacy applicationInsights-kind telemetry exporter, which the portal's monitoring experience no longer reliably recognizes. It expects the native OTLP/OpenTelemetry exporter contract instead, backed by a workspace-based Application Insights resource with managed DCR/DCE endpoints.

Bicep (infra/ai-gateway/main.bicep, infra/main.bicep)

• Enable AzureMonitorWorkspaceIngestionMode: Enabled on the Application Insights resource so it generates managed DCR/DCE and OTLP ingestion endpoints.
• Remove the inline legacy exporter resource — OTLP endpoints/DCR are created asynchronously by Azure Monitor after Application Insights deployment, so they can't be read back within the same ARM deployment.
• Surface new outputs (AI_GATEWAY_APPLICATION_INSIGHTS_ID, AI_GATEWAY_PRINCIPAL_ID, AI_GATEWAY_TELEMETRY_EXPORTER_NAME) for the postprovision hook to consume.

Provisioning hooks (infra/scripts/configure-ai-gateway.sh / .ps1)

• Preprovision: register the Microsoft.Monitor resource provider; delete any pre-existing legacy exporter (exporter kind is immutable, so migrating an existing sample requires delete/recreate rather than update).
• Postprovision: poll Application Insights until it exposes OTLP metrics/logs/traces endpoints and a DCR id, then PUT an OpenTelemetry-kind exporter configured with managed-identity authentication (audience https://monitor.azure.com).
• Assign the Monitoring Metrics Publisher role (3913510d-42f4-4e42-8a64-420c390055eb) to the AI Gateway's system-assigned identity directly at the DCR scope via az role assignment create, rather than as a nested Bicep role assignment — the generated managed resource group carries a deny assignment that blocks nested ARM/Bicep writes, but a direct out-of-band call succeeds.

Docs (IMPLEMENTATION_NOTES.md)

• Document the new OTLP-based flow, why the role assignment happens outside Bicep, and that exporter kind is immutable when migrating existing deployments.

• Fixes Update AI Gateway monitoring to use the current OpenTelemetry configuration #9

[Paul Yuknewicz (paulyuk)]

Closing stale draft written against the legacy Microsoft.ApiManagement/service/gateways resource. Issue #9 will be re-assigned to @copilot on top of the new Microsoft.ApiManagement/aigateways Bicep structure from #23.