they are only applied to the data subsets that are presented in the dashboard. You can save  this dashboard by selecting  Save  at the top of the page. Figure 5-24 shows how this  dashboard looks with two visualizations added. Timelion is a time series data visualizer that enables you to combine totally independent data  sources within a single visualization. It’s driven by a simple expression language you use to  retrieve time series data, perform calculations to tease out the answers to complex questions  and visualize the results. The following example uses Timelion to compare time-series data about the number of logs  generated in the past hour, compared to the number of logs generated this hour. From this,  you can compare trends and patterns in data at different periods of time. For IBM Cloud  Private, this can be useful to see trends in the logs generated on a per-pod basis. For  example, the chart in Figure 5-25 compares the total number of logs in the current hour  compared with the previous hour and the chart in Figure 5-26 on page 187 compares the  number of logs generated by the image-manager pods in the last hour. Timelion Figure 5-25 Timelion chart comparing total logs in the current hour compared to the previous hour Figure 5-24 Kibana dashboard 186  IBM Cloud Private System Administrator’s Guide