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Create charts that are not (necessarily) time-based
This topic discusses using the transforming command, chart, to create visualizations that are not time-based.
The chart command
The chart command returns your results in a data structure that supports visualization of your data series as a chart such as a column, line, area, and pie chart.
Unlike the timechart command, which uses the _time default field as the x-axis, charts created with the chart command use an arbitrary field as the x-axis. With the chart command, you use the over keyword to determine what field takes the x-axis.
Examples
Example 1: Use web access data to show you the average count of unique visitors over each weekday.
sourcetype=access_* | chart avg(clientip) over date_wday
One of the options you have is to split the data by another field, meaning that each distinct value of the "split by" field is a separate series in the chart. If your search includes a "split by" clause, place the over clause before the "split by" clause.
The following report generates a chart showing the sum of kilobytes processed by each clientip within a given timeframe, split by host. The finished chart shows the bytes value taking the y-axis while clientip takes the x-axis. The delay value is broken out by host. After you run this search, format the report as a stacked bar chart.
sourcetype=access_* | chart sum(bytes) over clientip by host
Example 2: Create a stacked bar chart that splits out the http and https requests hitting your servers.
To do this, first create ssl_type, a search-time field extraction that contains the inbound port number or the incoming URL request, assuming that it is logged. The finished search would look like this:
sourcetype=access_* | chart count over ssl_type
After you run the search, format the results as a stacked bar chart.
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This documentation applies to the following versions of Splunk Cloud™: 6.6.3, 7.2.6, 7.0.2, 7.0.0, 7.0.3, 7.0.5, 7.0.8, 7.1.3, 7.1.6, 7.2.3, 7.2.4
Comments
The first example uses the function "avg(clientip)". Since clientip is non-numeric -- it's a IP address -- taking the average produces a null result. From the context, I believe you want dc(clientip), giving the count of distinct IP addresses.
Following up... to get the unique vistors count by day of week... if we assume the query may be run on periods greater than 1 week, I found I first had to get the stats for unique dates prior to taking the average. Here's the complete query:
sourcetype=access_* | eval fulldate=date_year. "-" . date_month . "-" . date_mday | stats dc(clientip) AS Date_Count by fulldate, date_wday | chart eval(round(avg(Date_Count),0)) AS Average_Daily_Count over date_wday | rename date_wday AS Day
Perhaps there's a simpler way.