July 3, 2025 - Introducing previous measurements values

Cumulocity Change Log Platform services
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Context

Change Type: Announcement
Product area: Platform services
Component: REST API
Deployed at:

Technical details

Build artifact: cumulocity (2025.218.0)

Description

Automated persistence for measurement values under the c8y_PreviousMeasurements fragment has been introduced. This allows for storing and querying the second most recent measurement values based on arrival time.

For details on how to enable the feature and how it works, refer to Managing data.

Breaking change: The Inventory API c8y_PreviousMeasurements fragment was added to the restricted properties list.

The c8y_Previous Measurements fragment is reserved for internal system use only and may not be used by external users.

Any request containing restricted properties will have those properties ignored by the platform — they will not be applied or saved.

Example:

If a user sends a request like the following::

{
    "name": "testDevice",
    "owner": "device_654321",
    "c8y_IsDevice": {},
    "c8y_PreviousMeasurements": {
        "c8y_Temperature": {
            "value": 25.4,
            "unit": "C"
        }
    }
}

With this release, the c8y_PreviousMeasurements fragment in the request will be ignored and will not be saved.