Exam AZ-303 topic 6 question 15 discussion

Actual exam question from Microsoft's AZ-303

Question #: 15
Topic #: 6

HOTSPOT -
You are developing a back-end Azure App Service that scales based on the number of messages contained in a Service Bus queue.
A rule already exists to scale up the App Service when the average queue length of unprocessed and valid queue messages is greater than 1000.
You need to add a new rule that will continuously scale down the App Service as long as the scale up condition is not met.
How should you configure the Scale rule? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Show Suggested Answer

Suggested Answer:

Box 1: Service bus queue -
You are developing a back-end Azure App Service that scales based on the number of messages contained in a Service Bus queue.

Box 2: ActiveMessage Count -
ActiveMessageCount: Messages in the queue or subscription that are in the active state and ready for delivery.

Box 3: Count -

Box 4: Less than or equal to -
You need to add a new rule that will continuously scale down the App Service as long as the scale up condition is not met.

Box 5: Decrease count by -
References:
https://docs.microsoft.com/en-us/azure/azure-monitor/platform/autoscale-common-metrics#commonly-used-service-bus-metrics https://docs.microsoft.com/en-us/Azure/azure-monitor/platform/autoscale-best-practices https://docs.microsoft.com/en-us/azure/service-bus-messaging/message-counters

by Yiannisthe7th at July 3, 2021, 6:56 p.m.

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Yiannisthe7th

Highly Voted 4 years, 1 month ago

This is the Order: 1]Service Bus Queue 2] Active Message Count 3] Average (Grain statistics) (You will not have COUNT) 4] Less than or equal to 5] Decrease count by

upvoted 21 times

rdemontis

4 years ago

exactly!

upvoted 2 times

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ravy_rv

3 years, 11 months ago

It asksed for 'queue length of unprocessed and valid queue messages' We should use Message Count metric.

upvoted 6 times

Spooky7

3 years, 8 months ago

No! Scale up metric is using average for metric so scale down should use average as well

upvoted 1 times

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altafpatel1984

3 years, 5 months ago

No. existing rule is for average count, so new rule will also have average.

upvoted 1 times

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zsedo

3 years, 10 months ago

I agree. Not just the actvie messages count. https://docs.microsoft.com/en-us/azure/service-bus-messaging/monitor-service-bus-reference#message-metrics

upvoted 2 times

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AberdeenAngus

Most Recent 3 years, 6 months ago

Def need Active Messages, because the question says " unprocessed and valid queue messages". The Messages metric includes the dead letter queue, not wanted here.

upvoted 1 times

AberdeenAngus

3 years, 5 months ago

I created a web app and Standard service bus, the scaling metrics I was offered were "Messages Processed/Instance (Avg)" or "Active Messages Processed/Instance (Avg)", it didn't seem to match this text You can scale by Service Bus queue length, which is the number of messages in the Service Bus queue. Service Bus queue length is a special metric and the threshold is the number of messages per instance. For example, if there are two instances and if the threshold is set to 100, scaling occurs when the total number of messages in the queue is 200 "https://docs.microsoft.com/en-us/azure/azure-monitor/autoscale/autoscale-common-metrics#commonly-used-service-bus-metrics" If anyone knows what's going on please say, I'll come back here before trying the exam.

upvoted 1 times

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