Most KQL running in production is subtly wrong. Wrong operators, unscoped subqueries, and alert rules that silently miss events due to ingestion latency. Here’s how to write queries you can actually defend.
Your team enabled logging everywhere, a responsible move. Then the Azure bill arrived. This post traces exactly why Log Analytics costs spiral without warning, what the AzureDiagnostics table is quietly doing to your budget, and how resource-specific tables plus DCR transformations give you back control.
