The event trigger timeline displays event start and stop times, giving insight into what events were happening at a specific time, and how long those event states were active. The UI consists of three components: the find events panel which gives you controls to step through the timeline, the Unit snapshot panel which shows a view of the unit's events and status at the exact time you are viewing on the timeline, and the Timeline panel, which visually displays the events and their duration.

Timeline

As you move through time left to right you see when and for how long events triggered by their presence on the timeline. The timeline can show several different timeframes (one hour, one day, one week, or one month), which are accessed with your mouse wheel, or clicking the plus and minus buttons at the top of the timeline. Different zoom levels alter the event resolution, for example when viewing a 5-minute event at the one month zoom it will not be visible, whereas if viewing the timeline in an hour window this very same event will have a large visible bar. Context menus on events in the timeline will give even further controls to interact with the history page and will be listed here (right click on the timeline or events to view the context menus).

1. Centerline - The exact point in time you are viewing in the timeline, the “Unit Snapshot” panel shows the units state at this point in time.
2. View Window - This displays the window of time you are currently viewing in the timeline, with buttons to zoom in and out (mouse wheel also zooms).
3. Event Details - Available in the event context menu (right click), will show further details about the event clicked on.
4. Save/Save As - Available in the event context menu (right click), saves and downloads an image of the timeline. “Save as” gives you a prompt to name it before saving.
5. Focus Range - Available in the event context menu (right click), opens the history page in a new tab with date/time range restricted to window currently being view, useful for digging into issues.
6. Focus Event - Available in the event context menu (right click), opens the history page in a new tab with date/time range restricted to the event that was clicked on, useful for digging into issues.

Find Events

The Find Events component lets us step through the timeline, stopping whenever we get to the start of a new event. The timeline will be scanned, forwards or backwards through time, breaking whenever the event or events in the drop-down list are found. If no event is selected, then the scanning will stop on any event.
Note: If you cannot see the events the timeline scan is stopping on it is likely because the event duration is shorter than the current view windows resolution can display and zooming in will reveal the event. 

1. Reset Timeline - Will reset the timeline to its initial state.
2. Event Select - Drop down list of possible events, selecting will limit the steps to only stopping on these events.
3. Step Forward/Back - Will scroll the timeline, either forward or backward in time, stopping on the next relevant event. Either the selected events or any event if none selected.

Unit Snapshot

The unit Snapshot panel displays a summary of the state of the unit at the exact time shown at the centerline of the map. You will notice this change as you move through the timeline by clicking though or stepping through events. This will show status, substatus, as well as any active alerts.

Focusing Events/Timeline

“Focusing” is a new tool in the timeline context menu that allows you to narrow in on the date/time ranges you really care about. 
When loading into the history page you will be presented with about the last 30 days of historical data. This can often be a lot of information and can sometimes be hard to parse through if you are interested in a specific real-world event like generator failure conditions. The focus feature lets us leverage the Timeline View Component’s “Find Event”  tool to help get through the noise and get to the data you want. 

For example, you can use the find event tool to quickly step to a unit's alarm condition, like coolant over temperature. Once found, you can right click and select “Focus Event in New Tab”. Now you have a new tab of the history page, with the datetime selector automatically set to the start and end date/time of the event. This sets all of the view components to display data from when that alarm was active, making tasks such as parsing through the data in the history table a much more manageable process.