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Blog posts
Moving 900+ GB of Prometheus Without a Cutover Weekend
An SRE running monitoring for latency-sensitive trading services describes how his team moved a 900+ GB Prometheus to VictoriaMetrics over several months with no cutover weekend and no migration incidents. They first deleted the series nobody queried, which cut the data that needed moving to well under half, then dual-wrote into VictoriaMetrics for about a quarter while rebuilding and comparing every dashboard. Alerts moved last, and roughly a hundred stale rules were retired instead of copied. The result was faster queries, far fewer alerts, and the end of an external SaaS bill.