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System Design Masterclass · Observability Monitoring
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A team spent two days debugging intermittent 500 errors in their API. They checked the code, reviewed recent deployments, scrutinized database queries, and found nothing wrong. The application logic was perfectly correct.
Then someone finally looked at the host machine. Disk usage: 99.8%. The operating system had run out of space for temporary files, log rotation had stopped, and the application couldn't write to disk, causing random failures whenever it tried to create temp files or write logs.
Application monitoring tells you what your software is doing. Infrastructure monitoring tells you whether the machine running your software has the resources to do it. No amount of perfect code can overcome a server with no disk space, no available memory, or a saturated network interface.
Three dominant approaches to infrastructure metrics collection, each with different cost and operational trade-offs.