PCA (Prometheus Certified Associate) sample exam question with answer 358

Question:
Which type of observability data is BEST represented by the following description?

The server failed to process the request with ID 1382-129030.

1. Log
2. Trace
3. Metric
4. Time Series

Answer:
A - correct answer
B - is incorrect as a trace is activity of a transaction or request as it flows through applications and shows how services connect, including code-level details. The given description is too simple to fully describe a trace. Thus, log is the best answer as a log is simply a textual description of an event
C - is incorrect as a metric is a numeric measurement. Nothing in the given description implies a numeric measurement
D - is incorrect as a time series records numeric measurements over time. Nothing in the given description implies a numeric measurement being made over time