Observability Study Portal

Quick recall Q&A

1. What's the difference between Grafana and Prometheus?

Prometheus: Time-series database + scraper + alerting rules Grafana: Visualization layer that queries Prometheus (and others)

2. How do you reduce dashboard load time?

• Use recording rules for complex queries
• Limit time range defaults
• Reduce panel count per dashboard
• Use instant queries for stats
• Avoid high-cardinality labels

3. Explain the LGTM stack

• Loki: Log aggregation (like Elasticsearch, but lighter)
• Grafana: Unified visualization for all telemetry
• Tempo: Distributed tracing storage
• Mimir: Long-term metrics storage (Prometheus-compatible)

4. How do you correlate logs, metrics, and traces?

• Use consistent labels (service name, environment)
• Add trace IDs to logs
• Configure exemplars in Prometheus
• Use Grafana's correlations feature to link panels