docs(validators): clarify telemetry labels

[MuncleUscles]

Summary

• Add a telemetry label contract to the validator monitoring guide.
• Warn validators to keep the release-provided Alloy config and only customize .env values.
• Add troubleshooting for the case where metrics reach Grafana Cloud but dashboards do not show the validator.

Sanitized evidence basis

Recent validator operations discussions showed multiple cases where telemetry was present in Grafana Cloud but invisible to standard dashboards because a hand-edited Alloy config changed the job label and omitted validator_name. Existing docs included a copyable Alloy setup but did not clearly state that the stock scrape component name and labels are required for dashboards, alerts, and uptime crediting.

Test plan

• git diff --check
• pnpm build

Note: Created by weekly docs-and-skills gap loop; draft for human review.

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