Our Azure Bill Spiked Overnight — Here's Exactly How We Cut It 60% (7 Real Fixes)

We run a multi-tenant analytics SaaS on Azure (.NET 9 / ASP.NET Core, Angular 19, ~110k MAU, ~3,200 req/sec). The bill was a boring ~\(4,800/mo for a year, then it climbed to ~\)12,100/mo in three wee