Contracts: Dynamic device quantities by last check-in, with machine names on invoices

Please add a native way for contract Dynamic Asset Quantities to count devices based on their last successful Gorelo agent check-in, while keeping the included machine names on the invoice.

The problem

Asset-tag-based quantities let us list machines on invoices, but stale devices can remain tagged and continue to be counted. We need billing quantities and the named device list to stay aligned without manually reviewing and excluding machines each month.

Requested behavior

• Configure a stale-device threshold for the contract or device line, such as 30, 60, or 90 days. These are examples; the threshold should be configurable.

• Automatically exclude a device from the billable quantity and invoice device list when its last check-in exceeds that threshold. This must work while the endpoint is offline.

• Automatically include the device again when it resumes checking in and meets the other contract criteria.

• Preserve existing asset-tag filters and explicit exclusions, such as secondary devices.

• Keep the asset record and history so exclusion from billing does not require deleting the device.

• Show which devices were included or excluded and why when reviewing the invoice.

Example

A contract includes 20 eligible devices. Two exceed the configured inactivity threshold, so the next invoice counts 18 and lists those same 18 machine names. If one returns before a later invoice is generated, it is included again, provided it still meets the contract criteria.

This could be implemented as a last-check-in filter directly in Dynamic Asset Quantities, or as a server-side activity-based asset tag that updates even when a device is offline. The requirement is native Gorelo device billing; it should not depend on an external security product.