**Related issue:** N/A
## Summary
Audits and updates `articles/custom-host-vitals.md` against Fleet's
guide-formatting and content-style skills, and documents that custom
host vitals can be used as Host vitals label criteria:
- Trimmed the opening from 3 paragraphs to 2, and added a sentence
pointing to the new labels use case.
- Renamed "Using a custom host vital in scripts and configuration
profiles" → "Reference a custom host vital in scripts and configuration
profiles" to match the imperative, action-led heading style used by
sibling sections.
- Dissolved the standalone "Known limitations and issues" section — its
items are now `> **Note:**`/`> **Warning:**` callouts placed next to the
step each one actually affects, instead of collected at the bottom. The
delete-protection callout now also covers Host vitals labels, not just
scripts/profiles.
- Removed em dashes and bolding used for emphasis rather than UI
elements, per Fleet's content style guide.
- New "Filter hosts by a custom host vital" section (UI + GitOps)
documenting the existing Host vitals label type's support for custom
host vitals, including the current exact-match-only limitation.
# Checklist for submitter
- [ ] QA'd all new/changed functionality manually
kitzy
f656ac533a
