based on CQA 2.0 for key concepts.

Fix needed for the following:

1. Short descriptions:

Too long:

• modules/monitoring-understanding-alert-routing-for-user-defined-projects
• controlling-the-impact-of-unbound-attributes-in-user-defined-projects
• adding-cluster-id-labels-to-metrics

Self-referential language: monitoring-searching-alerts-silences-and-alerting-rules

2. Concider moving "monitoring-optimizing-alerting-for-user-defined-projects" and "monitoring-tips-for-optimizing-alerting-rules-for-core-platform-monitoring" to a different place. It might fit more in the procedures sections.