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Metrics for Azure IoT OPC UA Broker Preview

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Important

Azure IoT Operations Preview – enabled by Azure Arc is currently in PREVIEW. You shouldn't use this preview software in production environments.

See the Supplemental Terms of Use for Microsoft Azure Previews for legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.

Azure IoT OPC UA Broker Preview provides a set of observability metrics that you can use to monitor and analyze the health of your solution. This article lists the available metrics for OPC UA Broker. The following sections group related sets of metrics, and list the name and description for each metric.

Crosscutting

Metric name Definition
aio_opc_MQTT_message_publishing_retry_count The number of retries that it took to publish an MQTT message.
aio_opc_MQTT_message_publishing_duration The span of time to publish a message to the MQTT broker and receive an acknowledgement.

Supervisor

Metric name Definition
aio_opc_asset_count The number of assets that are currently deployed.
aio_opc_endpoint_count The number of asset endpoint profiles that are deployed.
aio_opc_asset_datapoint_count The number of data points that are defined across all assets.
aio_opc_asset_event_count The number of events that are defined across all assets.
aio_opc_runtime_supervisor_settings_updates_count The number of times the application settings were updated.
aio_opc_connector_restart_count The number of times a connector instance had to be restarted.
aio_opc_connector_failover_duration The duration of a connector instance failover. This spans from when the connector was detected as missing until the passive connector instance confirms its activation.
aio_opc_connector_asset_count The number of assets assigned per connector instance.
aio_opc_connector_endpoint_count The number of endpoints assigned per connector instance.
aio_opc_connector_load A number that indicates the load per connector instance.
aio_opc_schema_connector_count The number of connector instances per schema.

Sidecar

Metric name Definition
aio_opc_message_egress_size The number of bytes for telemetry sent by the assets.
aio_opc_method_request_count The number of method invocations received.
aio_opc_method_response_count The number of method invocations that have been answered.
aio_opc_module-connector_error_receive_count The number of error signals received by the module connector.
aio_opc_MQTT_queue_ack_size The number of incoming MQTT messages with QoS higher than 0 which delivery acknowledgement is yet to be sent to MQTT broker.
aio_opc_MQTT_queue_notack_size The number of incoming MQTT messages with QoS higher than 0 in the acknowledgement queue which acknowledgement period timed out due to delay in acknowledgement of previous messages.
aio_opc_MQTT_message_processing_duration The duration of the processing of messages received from the MQTT broker (method invocations, writes).

OPC UA Connector

Name Definition
aio_opc_output_queue_count The number of asset telemetry items (data changes or events) that are queued for publish to the MQTT broker.
aio_opc_session_browse_invocation_count The number of times browse was invoked for sessions.
aio_opc_subscription_transfer_count The number of times a subscription was transferred.
aio_opc_asset_telemetry_data_change_count The number of asset data changes that were received.
aio_opc_asset_telemetry_event_count The number of asset events that were received.
aio_opc_asset_telemetry_value_change_count The number of asset value changes that were received.
aio_opc_session_connect_duration The duration of the OPC UA session connection.
aio_opc_data_change_processing_duration The processing duration of data changes received from an asset. This spans from when the connector receives the event until the MQTT broker provides a publish acknowledgement.
aio_opc_event_processing_duration HThe processing duration of events received from an asset. This spans from when the connector receives the event until the MQTT broker provides a publish acknowledgement.

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