The instrumentation that shows what a running system is doing: metrics, logs, error tracking, and alerts that notify the team when something degrades, ideally before users notice.
Without it, you learn about outages from customers and debug by guesswork. Observability is the difference between fixing an incident in twenty minutes and spending a day reproducing it.
We set up error tracking, uptime checks, performance metrics, and alert routing before launch, define what is worth waking someone for, and keep dashboards your team can read without us.