You are ready to deploy a new feature of a web-based application to production. You want to use Google Kubernetes Engine (GKE) to perform a phased rollout to half of the web server pods.
What should you do?

1. A. Use a partitioned rolling update.
2. B. Use Node taints with NoExecute.
3. C. Use a replica set in the deployment specification.
4. D. Use a stateful set with parallel pod management policy.

Correct Answer: A
https://medium.com/velotio-perspectives/exploring-upgrade-strategies-for-stateful-sets-in-kubernetes-c02b8286f

You manage an application that is writing logs to Stackdriver Logging. You need to give some team members the ability to export logs. What should you do?

1. A. Grant the team members the IAM role of logging.configWriter on Cloud IAM.
2. B. Configure Access Context Manager to allow only these members to export logs.
3. C. Create and grant a custom IAM role with the permissions logging.sinks.list and logging.sink.get.
4. D. Create an Organizational Policy in Cloud IAM to allow only these members to create log exports.

Correct Answer: A
https://cloud.google.com/logging/docs/access-control

You are creating and assigning action items in a postmodern for an outage. The outage is over, but you need to address the root causes. You want to ensure that your team handles the action items quickly and efficiently. How should you assign owners and collaborators to action items?

1. A. Assign one owner for each action item and any necessary collaborators.
2. B. Assign multiple owners for each item to guarantee that the team addresses items quickly
3. C. Assign collaborators but no individual owners to the items to keep the postmortem blameless.
4. D. Assign the team lead as the owner for all action items because they are in charge of the SRE team.

Correct Answer: A
https://devops.com/when-it-disaster-strikes-part-3-conducting-a-blameless-post-mortem/

Your company follows Site Reliability Engineering principles. You are writing a postmortem for an incident, triggered by a software change, that severely affected users. You want to prevent severe incidents from happening in the future. What should you do?

1. A. Identify engineers responsible for the incident and escalate to their senior management.
2. B. Ensure that test cases that catch errors of this type are run successfully before new software releases.
3. C. Follow up with the employees who reviewed the changes and prescribe practices they should follow in the future.
4. D. Design a policy that will require on-call teams to immediately call engineers and management to discuss a plan of action if an incident occurs.

Correct Answer: B

You are responsible for the reliability of a high-volume enterprise application. A large number of users report that an important subset of the application’s functionality – a data intensive reporting feature – is consistently failing with an HTTP 500 error. When you investigate your application’s dashboards, you notice a strong correlation between the failures and a metric that represents the size of an internal queue used for generating reports. You trace the failures to a reporting backend that is experiencing high I/O wait times. You quickly fix the issue by resizing the backend’s persistent disk (PD). How you need to create an availability Service Level Indicator (SLI) for the report generation feature. How would you define it?

1. A. As the I/O wait times aggregated across all report generation backends
2. B. As the proportion of report generation requests that result in a successful response
3. C. As the application’s report generation queue size compared to a known-good threshold
4. D. As the reporting backend PD throughout capacity compared to a known-good threshold

Correct Answer: B
According to SRE Workbook, one of potential SLI is as below:
* Type of service: Request-driven
* Type of SLI: Availability
* Description: The proportion of requests that resulted in a successful response. https://sre.google/workbook/implementing-slos/