fleet/changes/34500-os-versions
Victor Lyuboslavsky ba5f02f9ca
os_versions endpoint performance improvements (#34897)
<!-- Add the related story/sub-task/bug number, like Resolves #123, or
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**Related issue:** Resolves #34500 and Resolves #33758

Video demo: https://www.youtube.com/watch?v=4HZlKG0G1B0

- Added a new aggregation table
`operating_system_version_vulnerabilities` for faster queries. The table
is currently used only for Linux vulnerabilities, but could be used for
other OS vulnerabilities.
- Added `max_vulnerabilities` parameter per [API
doc](https://github.com/fleetdm/fleet/pull/33533)
- Also added `max_vulnerabilities` parameter to `os_versions/{id}`
endpoint, but not making it public since that endpoint is still slow and
needs other API changes. bug #34974
- Removed `"kernels": []` from `os_versions` endpoint result

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.

- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)

## Testing

- [x] Added/updated automated tests
- [x] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)

- [x] QA'd all new/changed functionality manually

## Database migrations

- [x] Checked schema for all modified table for columns that will
auto-update timestamps during migration.
- [x] Confirmed that updating the timestamps is acceptable, and will not
cause unwanted side effects.
- [x] Ensured the correct collation is explicitly set for character
columns (`COLLATE utf8mb4_unicode_ci`).

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added ability to limit the number of vulnerabilities displayed for
operating system versions via an optional parameter.
* Introduced vulnerability count tracking for operating system versions,
now visible in API responses and UI displays.
* Enhanced operating system vulnerability visualization with improved
count-based rendering.

* **Tests**
* Added comprehensive test coverage for vulnerability limiting behavior
across multiple operating system versions and architectures.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2025-11-03 13:07:44 -06:00

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Improved performance of `/api/latest/fleet/os_versions` endpoint, especially for deployments with Linux hosts.