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Trending not working properly / average values not displayed

Solved1.12K views19th February 2024average trending real time trending trending trending data Trending monitoring
4
Nils Hoven [DevOps Advocate]1.12K 31st January 2024 0 Comments

Hi Dojo,

we are using self-developed drivers / connectors for some elements which have only a limited and simple set of parameters. For some of these parameters we have trending activated in a trend template (real-time & average). But all we see is the real-time trend data, and no long term average data.

In the system settings we've set the TTL of the real-time trend data to 2 days (instead of default 1 day), and this has an effect on the trend graph as expected!

What may be the root cause for the missing average trend data? We've already checked the driver implementation and compared it to other drivers, also self-developed, where trending is working just fine.

Any ideas where to look at? Thank you very much! 🙂

Edit:

Nils Hoven [DevOps Advocate] Selected answer as best 19th February 2024

3 Answers

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Nils Hoven [DevOps Advocate]1.12K Posted 19th February 2024 1 Comment

Meanwhile, we have discovered that the data type defined in the driver was the root cause for this issue. In the driver which was having trouble with trending this was set to "string" for numerical values we wished to trend - this was now set to "double" and trending looks good!

<Param id="34" trending="true">
<Name>Delay_1</Name>
<Description>Delay_1</Description>
<Type>read</Type>
<Information>
</Information>
<Interprete>
<RawType>numeric text</RawType>
<Type>double</Type>                   <- this is where the change was made
<LengthType>next param</LengthType>
</Interprete>
<Alarm>
<Monitored>true</Monitored>
</Alarm>
<Display>
<RTDisplay>true</RTDisplay>
<Positions>
<Position>
<Page>General</Page>
<Column>0</Column>
<Row>2</Row>
</Position>
</Positions>
<Units>ms</Units>
</Display>
<Measurement>
<Type>number</Type>
</Measurement>
</Param>

Pieter Van Compernolle [SLC] [DevOps Enabler] Posted new comment 19th February 2024
Pieter Van Compernolle [SLC] [DevOps Enabler] commented 19th February 2024

Great to hear you’ve found the root cause. Interprete type ‘String’ would indeed result in processing the value as a string, which makes it difficult to ‘average’. Thanks a lot for sharing the solution to this problem

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