☰
Desktop Only
These koans require a larger screen. Please visit on a desktop browser.
Koan 2 of 19
← Telemetry What is a Metric? →

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.

Continue →