Prometheus
Medium — good to knowCI/CD & DevOps
ELI5 — The Vibe Check
Prometheus scrapes your services every 15 seconds asking 'how are you?' and stores the answers (metrics) as time series. It speaks its own query language (PromQL) that lets you ask 'how many errors per second in the last 5 minutes?' It's pull-based, meaning Prometheus goes to your services, not the other way around.
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