EVALS & OBSERVABILITY • 252 / 397
Measure whether the AI is good and trace where it fails.
Span
A span is one timed operation inside a trace.
Think of it like
Think of Span like testing and telemetry for any production service: quality must be measured, not guessed.
Real life
Teams use Span to decide whether a new release is safer, faster or more useful.
SRE lens
One model call, vector search or tool call can each be a span.
Remember thisA span is one timed operation inside a trace.