Time-Series Metrics Monitoring (Prometheus) — System Design Problem

System Requirements

High-density time-series data compression (Gorilla / DoubleDelta encoding)
Automated downsampling from 10s raw to 5m, 1h, and 1d rollups
Fast dashboard query rendering for Grafana visualization
Rule evaluation engine triggering alerts on anomaly thresholds

Graded Constraints

01Cost limit: $6,000/month

02Time-series database / NoSQL for metric storage

03Query & ingestion service layer

04In-memory cache for recent hot metrics

05Alerting notification service dispatch

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