PCA (Prometheus Certified Associate) sample exam question with answer 375

Question:
What is the definition of a distributed trace?

1. A numeric measurement
2. Activity of a transaction or request as it flows through applications and shows how services connect, including codelevel details
3. A numeric measurement recorded over time
4. A textual representation of an event, commonly structured with key-value pairs

Answer:
B - is the correct answer
A - this is the definition of a metric
C - this is the definition of a time series
D - this is the definition of a log