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**Related issue:** Resolves#33776
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [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] 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] Ensured the correct collation is explicitly set for character
columns (`COLLATE utf8mb4_unicode_ci`).
Feature: Improve our capability to detect vulnerable software on Ubuntu hosts
To improve the capability of detecting vulnerable software on Ubuntu, we are now using OVAL definitions to detect vulnerable software on Ubuntu hosts. If data sync is enabled (disable_data_sync=false) OVAL definitions are automatically kept up to date (they are 'refreshed' once per day) - there's also the option to manually download the OVAL definitions using the 'fleetctl vulnerability-data-stream' command. Downloaded definitions are then parsed into an intermediary format and then used to identify vulnerable software on Ubuntu hosts. Finally, any 'recent' detected vulnerabilities are sent to any third-party integrations.
* Add host count to software API
* Update docs
* Update fleetctl tests to account for host counts
* Update docs to mention host_count special case
* Update func comment
- Include only hosts that the user has access to in search targets API.
- Add parameter to specify whether `observer` hosts should be included.
- Generate counts based on which hosts user can access.
- Update API doc.
- Maintain software inventory with detail queries.
- Associated database migrations.
- Feature flagged off by default (see documentation for details to turn on).
- Documentation.
- New test helper for slice element comparisons skipping ID.
