<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**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 -->
Resolves#33147
# 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`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.
## 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 table schema to confirm autoupdate
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- Bug Fixes
- Resolved MySQL performance regressions from 4.73.0/4.73.1 affecting OS
versions and software titles views, improving load times and reducing
timeouts.
- Refactor
- Optimized OS vulnerabilities fetching by batching multiple OS versions
in a single request.
- Added a supporting database index to speed kernel-related
vulnerability queries.
- Tests
- Added comprehensive tests for multi-OS vulnerability retrieval, CVSS
enrichment, team-scoped data, and service endpoint behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky