<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#43050
## Testing
- [x] QA'd all new/changed functionality manually
Confirmed the traffic sequence with ngrok and DDM stats are as expected
in the osquery-perf logs:
### Adding a new DDM
* `DeclarativeManagement` command and Ack
* `tokens` request
* `declaration-items` request
* `activation` for the DDM
* `configuration` for the DDM
* `tokens` request confirms changes settled
* `status` request
### Remove/re-add DDM (no global change)
* `DeclarativeManagement` command and Ack
* `tokens` request
### Adding a second DDM
* `DeclarativeManagement` command and Ack
* `tokens` request
* `declaration-items` request
* `activation` for the new DDM only
* `configuration` for the new DDM only
* `tokens` request confirms changes settled
* `status` request
### Removing a DDM
* `DeclarativeManagement` command and Ack
* `tokens` request
* `declaration-items` request
* `tokens` request
* `status` request
### Remove all DDMs
* `DeclarativeManagement` command and Ack
* `tokens` request
* `declaration-items` request
* `tokens` request
* `status` request
---
State correctly updates on the host's profiles:
<img width="1246" height="512" alt="image"
src="https://github.com/user-attachments/assets/0d289d4e-1e9b-4283-aef0-fd1ab3ecb355"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Improved macOS Declarative Management sync: faster convergence,
fetches only changed declarations, detects removals, and sends
consolidated status updates.
* **Monitoring**
* Added metrics to track declaration token fetch success and error
rates.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
For #24870 subtask
API changes doc: #25293
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files)
for more information.
- [x] Added support on fleet's osquery simulator `cmd/osquery-perf` for
new osquery data ingestion features.
- [x] Added/updated automated tests
- [x] Manual QA for all new/changed functionality
- For Orbit and Fleet Desktop changes:
- [x] Orbit runs on macOS, Linux and Windows. Check if the orbit
feature/bugfix should only apply to one platform (`runtime.GOOS`).
- [x] Manual QA must be performed in the three main OSs, macOS, Windows
and Linux.
- [x] Auto-update manual QA, from released version of component to new
version (see [tools/tuf/test](../tools/tuf/test/README.md)).
