Challenge · Medium

Latency Hunt

Users say checkout is "sometimes broken". There is no dashboard yet, only an access log. Find the failing endpoint, count the damage and build the error-rate tool.

logsawkerror ratesre

Practises the module Monitoring with Prometheus & Grafana.

The ticket

TICKET SRE-512: checkout sometimes fails

Support got 40 complaints in two hours. The only data is the web server's access log, /var/log/nginx/access.log, one request per line with status code and response time (rt= seconds).

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