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Impact of Default Transformation on Metric Events

arnel
Observer

Dear Dynatrace Community,

 

I have been searching for quite a while on the web without any success for the following scenario:

One of our customer's requirements is to display the latencies of specific requests between two service components in a dashboard and also configuring alerting based upon agreed latency thresholds. For the calculation of the latencies, it was agreed that data gaps should also be interpreted as "0" and not "no data". This was managed with the default transformation "default(0)".

Question: The question now arises as to how this affects alerting if we activate "Alert on missing data"?

At the moment we assume "default(0)" replaces our data gaps "no data" with "0" and therefore this would mean that data is not missing, because"0" requests have been received . Is this correct?

Question 2: But what does now "no data" in this context mean? If the host goes offline, the service status gets inactive, OneAgent loses connection to Dynatrace, etc. I am asking this question out of curiosity, because if the host goes offline or the service is inactive, but "alert on missing data" is turned on and "default(0)" also in place, will an alert be triggered or will this behave differently?

I have read a few topics related to the default transformation and alerting, just to mention some:

However, I did not find anything on the official documentation on the exact behaviour when "default(0)" is in place and "Alert on missing data" turned on.

 

I would appreciate any help and also references if possible on this subject.
Thank you,
Arnel

3 REPLIES 3

Mizső
DynaMight Leader
DynaMight Leader

Hi @arnel,

Default transformation can be use on a visualization. Your metric timeseries will not extened with the default value just for the visualization purposes.

I hope it helps.

Best regards,

Mizső  

Certified Dynatrace Professional

Hi @Mizső 

thank you very much for your answer, but is the default transformation really only used for visualization purposes? Because when we use default(0) for "no data" and also turn "alert on missing data" on, will we receive alerts for default(0) or "no data"? I cannot find anything related to this on the official Dynatrace documentation page.

Br,
Arnel

Mizső
DynaMight Leader
DynaMight Leader

Hi @arnel,

Sorry for my late response. It is a good question and maybe I have ot change my previous answer becasue you can create an metric event from a metric expression where you can use the default(0). Mybe in this case there will not be "alert on missing data" only if the metric provider is down. I have to try / check it.

Best regards,

Mizső

Certified Dynatrace Professional

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