Prometheus Certified Associate case studies
Prometheus Certified Associate · Put your knowledge to work in context.
The Prometheus Certified Associate (PCA) is a pre-professional certification from the Linux Foundation that validates foundational knowledge of observability and hands-on skill with Prometheus, the open source systems monitoring and alerting toolkit. It is aimed at engineers and application developers with a special interest in observability and monitoring; the source notes that ideal candidates may already hold Kubernetes certifications such as KCNA, CKA, or CKAD, or have completed Prometheus-specific training or cloud engineer bootcamps. The Prometheus Certified Associate case studies are 5 cases and about 3,743 words.
1Cardinality Budget for a Payments API
A payments team ships a Go service exposing a single counter, http requests total , labelled with method , path , status , customer id and region . The environment currently has 4 methods, about 60 distinct raw URL paths, 12 status codes, 8,000 active customers and 6 regions.
753 words, about 4 min2Scrape Timeouts Versus Real Target Failures
One Prometheus 2.x server scrapes 1,200 targets every 15 s with scrape timeout: 10s and evaluates recording and alerting rules every 15 s. The API gateway exposes /metrics from the same process and thread pool that serves user traffic; at peak, rendering that endpoint takes 9–12 s.
744 words, about 4 min3Why the p99 Panel Disagrees With the Traces
A service runs on 12 replicas, scraped every 30 s, and exposes a Go histogram http request duration seconds with buckets at 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10 and +Inf. The latency panel query is histogram quantile(0.99, sum by (le) (http request duration seconds bucket)) and it reports p99 ≈ 4.8 s.
732 words, about 4 min4Batch Jobs, Slow Exporters and Misranged Buckets
A team runs three things behind one Prometheus that scrapes every 30 s with scrape timeout: 10s . (a) A nightly reconciliation job - 4 containers, 90 s of runtime, once every 6 hours - pushes to a Pushgateway, because "Prometheus cannot scrape a job that short".
767 words, about 4 min5Alert Storm During a Rack Outage
An incident takes down a rack: 40 hosts go unreachable at once, and within two minutes 300 alerts reach a single Alertmanager. The relevant config is group by: ['alertname', 'instance'] with group wait: 30s , group interval: 5m , repeat interval: 4h , and one Slack receiver.
747 words, about 4 min