🔍 What Prometheus Does

✅ 1. Pulls Metrics

Prometheus scrapes metrics from services exposing them over HTTP, typically at:

actuator/prometheus

This endpoint returns data in a text format like:

# HELP jvm_memory_used_bytes Used bytes of a given JVM memory area.
jvm_memory_used_bytes{area="heap",id="G1 Eden Space",} 4.5729792E7

✅ 2. Stores Time-Series Data

All scraped metrics are stored with timestamps so you can:

• Query them with PromQL
• Plot graphs
• Set up alerts

✅ 3. Provides Querying & Alerting

Using PromQL (Prometheus Query Language), you can create dashboards (e.g., Grafana) or alerts like:

rate(http_server_requests_seconds_count{status="500"}[1m]) > 5

⚙️ How It Works with Spring Boot

You’re using:

management.endpoint.prometheus.enabled=true
management.endpoints.web.exposure.include=prometheus,health,info

So your app is ready to expose metrics at:

actuator/prometheus