Service to find changes in the PI System
As a programmer, I want to be able to use the PI Web API to find out about changes in the PI System. This mean Elements, Templates, Attributes, Event Frames and PI Point configuration changes.
“Finding changes in the PI System” is still being evaluated.
Correction: Previously this was shown as “planned” and part of Stream Updates. Stream Updates will allow you to retrieve data updates instead of having to retrieve the entire stream.
The upcoming PI Web API 2018 SP1 release will tell the caller if the stream has changed (e.g., the PI Point data reference was changed to a different PI Point), so that the caller can re-subscribe to the correct stream. It will not provide a mechanism to know what specifically those changes are on the stream, nor on the entire PI System.
Piero Steinger commented
We need it as well. Our use case are alarms: we'd like to get push notifications over websockets when a new EventFrame is created or an existing one is changed. Useful would be for example an EventFrame stream, where we could filter on the referenced elements and EventFrame template.