SRE Step 2

What do you think makes a metric a good measure of happiness? Choose all responses that are correct (2 correct responses).

• It closely tracks well-known system behavior

• It is derived by scraping social media for complaints

• It is a close approximation of the user experience

• It shows long-term trends clearly

• It reacts quickly to changes and outages

What are some characteristics of SLIs? Select all that apply (2 correct responses).

• A quantitative measurement of a user experience.

• Expressed as a proportion of all valid events that were good.

• They should never be used for setting SLOs.

• Metrics that measure usage of an app.

Which of these is an example of an SLI?

• 95% of requests have low latency

• Proportion of HTTP requests served successfully

• 99% of HTTP requests are successful

• Proportion of users that are happy

Which of these scenarios would a quality SLI be appropriate for? Select all that apply (2 correct responses).

• Load balancers failing requests because they couldn't find a healthy backend

• Serving stale data from cache because the database is overloaded

• Returning results after searching only a subset of data to save CPU cycles when overloaded

• Cancelling long-running operations because of a timeout

One commonly used signifier of success or failure is the status code of an HTTP or RPC response. How can this be problematic?

• The response contents might not match the status code.

• Your application frameworks might not give you enough control over the status code.

• You risk double counting events recorded in the application.

• There are too many status codes, classifying them as good or bad can be difficult.

Both Correctness and Coverage SLIs need an external source of truth to compare against. Why is this?

• It allows the SLIs to detect invalid data.

• It allows the SLIs to detect badly-behaving users.

• It allows the SLIs to detect accidental corruption.

• It allows the SLIs to detect misbehavior of the system.

Which of the following descriptions does not indicate toil?

• Manual

• Annoying

• Repetitive

• Automatable

• No enduring value

What are effects of too much toil?

• Career stagnation

• Low morale

• Sets precedent

• Slows progress

• Promotes attrition