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OtOpcUaTelemetry (Commons/Observability) centralizes the project's Meter + ActivitySource so all instrumentation points emit through a single named surface. Counters cover the hot paths: otopcua.deploy.applied (outcome=ack|reject) otopcua.deploy.apply.duration (s, histogram) otopcua.driver.lifecycle (event=spawn|spawn_stub|stop|fault) otopcua.virtualtag.eval (outcome=ok|fail|skip) otopcua.scriptedalarm.transition (state=activated|acknowledged|cleared) otopcua.opcua.sink.write (kind=value|alarm|rebuild) otopcua.redundancy.service_level_change (level=byte) Plus two ActivitySource spans: otopcua.deploy.apply wraps DriverHostActor.ApplyAndAck otopcua.opcua.address_space_rebuild wraps OpcUaPublishActor.HandleRebuild Instruments are no-op until a listener attaches, so tests + dev hosts pay nothing for unread telemetry. Host Program.cs gains AddOtOpcUaObservability() (binds the OtOpcUa Meter + ActivitySource to OpenTelemetry, attaches a Prometheus exporter) and MapOtOpcUaMetrics() (mounts /metrics scrape endpoint). Driver-side internals + ASP.NET request metrics deliberately stay off — the scrape payload is scoped to OtOpcUa signals only. Tests use MeterListener + ActivityListener to verify VirtualTagActor.eval, OpcUaPublishActor.AttributeValueUpdate, and RebuildAddressSpace actually emit on the central instruments. Runtime suite is 72 / 72 green (+3). Closes #105. Path A (F13b/c/d) complete; next batch options: #85 UNS folder hierarchy in SDK, or F8b/F9b production engine bindings.