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Exam Professional Cloud DevOps Engineer topic 1 question 74 discussion

Actual exam question from Google's Professional Cloud DevOps Engineer
Question #: 74
Topic #: 1
[All Professional Cloud DevOps Engineer Questions]

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?

  • A. As the I/O wait times aggregated across all report generation backends
  • B. As the proportion of report generation requests that result in a successful response
  • C. As the application's report generation queue size compared to a known-good threshold
  • D. As the reporting backend PD throughout capacity compared to a known-good threshold
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by Nik22 at Oct. 29, 2021, 5:03 p.m.

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NXD
Highly Voted 3 years, 1 month ago
The question is: "create an availability SLI for the report generation feature." => availability. B is correct. Others aren't availability SLI.
upvoted 20 times
MF2C
3 years, 1 month ago
B is more like SLO rather than SLI.
upvoted 3 times
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Shasha1
Highly Voted 3 years, 1 month ago
B is correct, availability = good time/ total time.
upvoted 7 times
Manh
3 years, 1 month ago
AGREE WITH B
upvoted 3 times
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Meyucho
Most Recent 1 year ago
C and D are SLOs (they use a threshold). B seems to be more like an indicator and didn't rely exclusivelly on PD's I/O. Any issue that disturb the correct reports finalization could be detected with this SLI
upvoted 1 times
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jomonkp
1 year ago
Selected Answer: B
option B
upvoted 2 times
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jacknguyen
1 year, 3 months ago
B is correct.
upvoted 1 times
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JonathanSJ
1 year, 11 months ago
Selected Answer: B
B. As the proportion of report generation requests that result in a successful response is a valid availability Service Level Indicator (SLI) for the report generation feature. This indicator measures the percentage of requests for report generation that are successfully completed, and it is an indicator of the service availability. This SLI provides a clear and measurable way to track the availability of the report generation feature. It is a simple and easy to understand metric, that it can be easily monitored and reported. It can be used to track the performance of the report generation feature over time and detect any potential issues that may cause it to become unavailable. It also allows you to detect and diagnose issues in the system quickly and take appropriate action to mitigate them. Additionally, it aligns well with the customer's expectation of the report generation feature as they want to see a high percentage of successful report generation requests, which indicates that the feature is working correctly.
upvoted 2 times
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leandrojpg
1 year, 12 months ago
https://cloud.google.com/stackdriver/docs/solutions/slo-monitoring/sli-metrics/overview?hl=pt-br
upvoted 2 times
leandrojpg
1 year, 12 months ago
ANS BBB see link
upvoted 1 times
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zellck
2 years, 1 month ago
Selected Answer: B
B is the answer.
upvoted 1 times
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paul223344
2 years, 8 months ago
Answer : B. the proportion of report generation requests that result in a successful response Question: create an AVAILABILITY SLI for the report generation feature 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/
upvoted 4 times
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maddy94
2 years, 8 months ago
Selected Answer: B
B is correct
upvoted 2 times
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cyrus86
2 years, 10 months ago
Selected Answer: C
Service Level Indicator, is a key metric used to determine whether or not the SLO is being met. To prevent overcomplicating things, it’s important to keep things simple and choose the right key metrics to monitor. Here Queue size is the key metric.
upvoted 2 times
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Sekierer
2 years, 11 months ago
Selected Answer: B
B is correct
upvoted 1 times
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KyubiBlaze
2 years, 11 months ago
Eliminate A, Eliminate C and D. SLI are always based on facts, not on KNOWN GOOD Answer B : good/total
upvoted 3 times
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TNT87
2 years, 11 months ago
Selected Answer: B
B B B B is the answer!
upvoted 2 times
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sindra
3 years, 1 month ago
should be D.. since the throughput and IOPS become the issue
upvoted 2 times
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giammydell
3 years, 1 month ago
Why not C, you already have a metric that represents the size of an internal queue
upvoted 2 times
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Nik22
3 years, 1 month ago
D for sure
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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