# Track a value change across a time period

**URL:** <https://discuss.elastic.co/t/track-a-value-change-across-a-time-period/136643>\
**Category:** Kibana\
**Created:** [June 20, 2018, 9:04am UTC](https://discuss.elastic.co/t/track-a-value-change-across-a-time-period/136643 "2018-06-20T09:04:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![kottapar](https://avatars.discourse-cdn.com/v4/letter/k/a87d85/32.png) [@kottapar](https://discuss.elastic.co/u/kottapar)\
**Post date:** [June 20, 2018, 9:04am UTC](https://discuss.elastic.co/t/track-a-value-change-across-a-time-period/136643/1 "2018-06-20T09:04:09Z")

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Hey guys,  
I'm trying to create a visualization to track for changes in a value.  
For example, we're collecting the inventory details of all linux servers every day. I'd like find the servers for which the cpu allocation has increased or decreased.  
I tried creating a line chart with sum of value on y-axis and date histogram on x-axis.

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**Author:** ![rashmi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rashmi/32/16391_2.png) [@rashmi](https://discuss.elastic.co/u/rashmi)\
**Post date:** [June 20, 2018, 3:48pm UTC](https://discuss.elastic.co/t/track-a-value-change-across-a-time-period/136643/2 "2018-06-20T15:48:25Z")

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Hi

Have u tried "derivative" metrics aggregation that allows exactly that, calculate the derivative of a specific other metric. [https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-derivative-aggregation.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-derivative-aggregation.html)

hope this helps,

Thanks  
Rashmi

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<div class="post-metadata">

**Author:** ![kottapar](https://avatars.discourse-cdn.com/v4/letter/k/a87d85/32.png) [@kottapar](https://discuss.elastic.co/u/kottapar)\
**Post date:** [June 26, 2018, 9:13am UTC](https://discuss.elastic.co/t/track-a-value-change-across-a-time-period/136643/3 "2018-06-26T09:13:23Z")

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Thanks for that. I'm trying it. However I have more than a 1000 servers and I want to display only those servers for which there is a change.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 24, 2018, 9:13am UTC](https://discuss.elastic.co/t/track-a-value-change-across-a-time-period/136643/4 "2018-07-24T09:13:39Z")

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