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Create log health dashboard using time based data

This article is about how to create a dashboard using log data. We want to analyze relevant time-sensitive data in a dynamic and visually meaningful way.

Use case

An example application is when an application or script feeds data from various endpoints or microservices via a central logging solution and this data is then to be visualized. You can find more information about a simple and scalable solution for central log management here: Centralize log collect... | LNC DOCS (lucanoahcaprez.ch)

This example graph displays values of a PowerShell script that runs at the log in of a user. The script then has statuses, which are then written to an Azure Log Analytics Workspace. This diagram can now be used to see at what time which status was created.

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Behind this view there is the following KQL query:

let start_time = {TimeRange:start};
let end_time = now();
let time_range = start_time - end_time;
<yourlogtable>
| where TimeGenerated >= start_time and TimeGenerated <= end_time
| make-series count() default=0 on TimeGenerated from start_time to end_time step 1h by State_s
| render timechart

This query uses the value of the variable "{TimeRange:start}" for dynamic change based on the selection. More on this dynamic strategy is described here: Use of variables & dyn... | LNC DOCS (lucanoahcaprez.ch)

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