SRE Observability & Logging 5

Question 1

What is 'synthetic monitoring' in the context of SRE observability?

Accepted Answer

Simulating user transactions against production or staging to proactively detect availability issues

Answer

Synthetic monitoring uses scripted probes or transactions to continuously test service availability and performance from an external perspective.

Question 2

Which logging anti-pattern causes the most problems during high-severity incidents?

Accepted Answer

Logging at DEBUG level in production, causing I/O saturation under load

Answer

Verbose DEBUG logging in production can saturate disk I/O and CPU under load, worsening incidents while making logs harder to search.

Question 3

In SRE, what is the purpose of 'USE method' metrics?

Accepted Answer

Measuring Utilization, Saturation, and Errors for every resource in the system

Answer

The USE method (Utilization, Saturation, Errors) is a framework for analyzing resource bottlenecks at the infrastructure layer.

Question 4

What is a 'dead man's switch' alert in SRE observability?

Accepted Answer

An alert that fires when a heartbeat or watchdog signal stops being received, indicating a silent failure

Answer

A dead man's switch alert fires when an expected periodic signal (heartbeat) is absent, detecting silent failures where nothing is logged.

Question 5

Which of the following is a key advantage of using a centralized tracing backend like Jaeger or Zipkin?

Accepted Answer

It provides a UI to visualize end-to-end request flows and identify latency bottlenecks across services

Answer

Centralized tracing backends store and visualize span data, enabling SREs to see the full request path and identify which service contributes most latency.

(SRE) Site Reliability Engineering Foundation Certification Practice Test

(SRE) Site Reliability Engineering Foundation Certification Practice Test

SRE Observability & Logging 5