# Understanding Azure IoT Edge OPCPublisher Diagnostic Information

**URL:** <https://forum.inductiveautomation.com/t/understanding-azure-iot-edge-opcpublisher-diagnostic-information/86164>\
**Category:** General Discussion\
**Created:** [February 22, 2024, 5:46am UTC](https://forum.inductiveautomation.com/t/understanding-azure-iot-edge-opcpublisher-diagnostic-information/86164 "2024-02-22T05:46:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![David\_Maryo](https://avatars.discourse-cdn.com/v4/letter/d/b77776/32.png) [@David\_Maryo](https://forum.inductiveautomation.com/u/David_Maryo)\
**Post date:** [February 22, 2024, 5:46am UTC](https://forum.inductiveautomation.com/t/understanding-azure-iot-edge-opcpublisher-diagnostic-information/86164/1 "2024-02-22T05:46:11Z")

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I would like to understand the below diagnostic information. Can someone shed some lights? Especially the `Ingress DataChanges (from OPC)` & `Ingress ValueChanges (from OPC)`

```auto
[05:43:44 INF Microsoft.Azure.IIoT.OpcUa.Edge.Publisher.Engine.DataFlowProcessingEngine]
  DIAGNOSTICS INFORMATION for : opc.tcp://<REDACTED>
  # Ingestion duration : 00:00:23:57 (dd:hh:mm:ss)
  # Ingress DataChanges (from OPC) : 2 (0/s)
  # Ingress ValueChanges (from OPC) : 154 (0.11/s)
  # Ingress BatchBlock buffer size : 0
  # Encoding Block input/output size : 0 | 0
  # Encoder Notifications processed : 154
  # Encoder Notifications dropped : 0
  # Encoder IoT Messages processed : 1
  # Encoder avg Notifications/Message : 154
  # Encoder avg IoT Message body size : 50,551 (19%)
  # Encoder avg IoT Chunk (4 KB) usage : 12.3
  # Estimated IoT Chunks (4 KB) per day: 781
  # Outgress Batch Block buffer size : 0
  # Outgress input buffer count : 0
  # Outgress input buffer dropped : 0
  # Outgress IoT message count : 1 (0/s)
  # Connection retries : 0

```

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [February 22, 2024, 11:31am UTC](https://forum.inductiveautomation.com/t/understanding-azure-iot-edge-opcpublisher-diagnostic-information/86164/2 "2024-02-22T11:31:31Z")

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Looks like the docs are here: [Industrial-IoT/docs/opc-publisher/observability.md at main · Azure/Industrial-IoT · GitHub](https://github.com/Azure/Industrial-IoT/blob/main/docs/opc-publisher/observability.md#runtime-diagnostics-output)