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Koan 2 of 19

Three Signals

A system speaks, but not with one voice.
It measures. It narrates. It records.
Three ways of seeing. Each reveals what the others cannot.
A stream of telemetry arrives. Sort these items into three groups.
Bucket A
click an item above, then choose A
Bucket B
click an item above, then choose B
Bucket C
click an item above, then choose C
Apply what you discovered. Which signal would you reach for in each scenario?
Your checkout is slow and getting worse over time. You need to see the trend.
A single request failed. You need to follow it through 4 services to find where it broke.
The database returned an error. You need the exact error message and timestamp.

Metrics measure. Traces narrate. Logs record.

Together, they are the three signals of observability.

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