Azure/azure-sdk-for-net Azure.Monitor.OpenTelemetry.Exporter

1.11.0-beta.1 (2026-11-09)

Added Attach SDK statistics per customer connection string observed in newly exported telemetry for multi-endpoint routing. A configured connection string alone no longer produces Attach in this mode, and offline-storage replays do not create or refresh Attach associations. Single-endpoint Attach is unchanged.
Multi-endpoint routing reads a new microsoft.ingestion_auth attribute. Telemetry marked "aad" is sent and stored separately from instrumentation-key telemetry for the same endpoint, in preparation for Microsoft Entra ID support.
Multi-endpoint routing can now be used with AzureMonitorExporterOptions.Credential. Only telemetry marked "aad" is sent with a token, scoped to the audience in the Azure.Monitor.OpenTelemetry.Exporter.MultiEndpointAadAudience AppContext value (public cloud by default). Without a credential, telemetry marked "aad" is dropped.
Added the experimental Azure.Monitor.OpenTelemetry.Exporter.Experimental.gen_ai_input_output_limit_increase AppContext switch. When enabled, the custom property truncation limit for gen_ai.input.messages and gen_ai.output.messages increases from 256 KiB to 4 MiB (characters) to support GenAI multimodal content. Limits are unchanged by default: 256 KiB for GenAI attributes and 8 KiB for all other custom properties.

Fixed a multi-endpoint offline-storage race where disk-size recounts discarded in-progress write reservations, potentially allowing storage to exceed its shared budget. (#63845)
Multi-endpoint Attach SDK statistics refresh version and attachment mode after late resource initialization.
Attach SDK statistics use monotonic time for reporting intervals and association expiry, avoiding delays caused by system clock adjustments.
Microsoft OpenTelemetry SDK statistics use the standard collector endpoint for all customer regions while retaining each item's EU/non-EU SDK statistics instrumentation key and customer key. Non-distro Breeze routing is unchanged.
Uploading telemetry from offline storage (at startup, on retry, and at shutdown) is no longer recorded as an HTTP dependency by HttpClient instrumentation.
(#63821)
Fixed LogFilteringProcessor behavior in .net 11 when RandomTraceId is set. (64084)

Updated OpenTelemetry and OpenTelemetry.Extensions.Hosting from 1.18.0 to 1.20.1, and OpenTelemetry.PersistentStorage.FileSystem from 1.1.1 to 1.1.3.
Removed registry-owned locks from multi-endpoint Attach SDK statistics observation and collection. Endpoint regions are cached, and observation is skipped when both stats regions are disabled.