Quick answer: Server cost ballooning unnoticed kills budgets and runways. Per-week budget alerts on CPU, RAM, network, and player-cost catch issues before they're invoiced.
A misbehaving feature can 10x your server bill in a week. Budget alerts make the 10x visible on day two.
Set hard budget caps
Cloud provider's billing alerts at 50%/75%/90% of monthly budget. Slack notification to engineering on each threshold.
Per-resource alerts
CPU above 80% for 30 minutes = page. RAM above 90% = page. Network egress 5x weekly average = investigate. Each has its own response.
Per-player-cost ratio
Cost per concurrent player. Trending up = bug or inefficiency. Trending down = win. Visible weekly.
Investigate every alert
Alerts that aren't investigated are noise. Document the response per alert type; investigate to a conclusion.
“Cost is operational quality. Treat it like uptime.”
Audit your infrastructure spend monthly. The 10% hidden waste accumulates; finding it pays for a junior engineer.