observability

Definition

The ability to understand what's happening inside a system by examining its outputs—logs, metrics, and traces. It's like having X-ray vision for your infrastructure, except the X-rays are JSON and they cost $10,000 per month in monitoring tools.

Example Usage

We need better observability—I can see that something's broken but I have no idea which service is causing it.

Origin

Borrowed from control theory, popularized in software by companies like Honeycomb in the 2010s

Fun Fact

The observability vendor market is worth billions, mostly because companies discovered that guessing why production is broken is more expensive than paying for fancy dashboards.

Source: Site reliability engineering and DevOps monitoring practices

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