Docs fix — applies_to: path /solutions/observability/applications — 4 pages

Generated by `gh-aw-docs-applies-to-sweep` for `elastic/docs-content` on 2026-W20.

Path /solutions/observability/applications · 4 total in scope · subtree corpus 4 pages.

## Findings (3)

```yaml
- file: solutions/observability/applications/index.md
line: 6
category: invalid-applies-to-value
severity: high
evidence: "page-level applies_to uses both `stack` and `serverless`, which mixes primary dimensions; page-level applies_to must use a single primary dimension"
suggested_fix: |
applies_to:
stack: ga

- file: solutions/observability/applications/llm-observability.md
line: 1
category: missing-applies-to
severity: high
evidence: "frontmatter has no applies_to key"
suggested_fix: |
applies_to:
stack: ga

- file: solutions/observability/applications/otel-rum.md
line: 4
category: invalid-applies-to-syntax
severity: high
evidence: "applies_to block contains empty or malformed mappings (e.g., `stack:` with no value, `serverless.observability:` with no lifecycle, and `product: preview` which misuses the `product` key)
suggested_fix: |
applies_to:
serverless:
observability: preview
```

## Done when
- All listed pages have a valid `applies_to` block per the verified reference.

> Generated by [Docs `applies_to` sweep agent](https://github.com/elastic/docs-content/actions/runs/25805890362/agentic_workflow) · ● 77.2K · [◷](https://github.com/search?q=repo%3Aelastic%2Fdocs-content+is%3Aissue+%22gh-aw-workflow-call-id%3A+elastic%2Fdocs-content%2Fgh-aw-docs-applies-to-sweep%22&type=issues)