While panning through time and zooming in/out from charts is helpful when you're looking a recent history, or want to do granular troubleshooting, what if you want to see metrics from 6 hours ago? Or 6 days?
Netdata's dashboard features a timeframe selector to help you visualize specific timeframes in a few helpful ways. By default, it shows a certain number of minutes of historical metrics based on the your browser's viewport to ensure it's always showing per-second granularity.
To visualize a new timeframe, you need to open the picker, which appears just above the menu, near the top-right cover of the dashboard.
The Clear button resets the dashboard back to its default state based on your browser viewport, and Apply closes the picker and shifts all charts to the selected timeframe.
Click any of the following options in the Quick Selector to choose a commonly-used timeframe.
- Last 5 minutes
- Last 15 minutes
- Last 2 hours
- Last 6 hours
- Last 12 hours
Click Apply to see metrics from your selected timeframe.
Beneath the Quick Selector is an input field and dropdown you use in combination to select a specific timeframe of minutes, hours, days, or months. Enter a number and choose the appropriate unit of time, then click Apply.
Use the calendar to select multiple days. Click on a date to begin the timeframe selection, then an ending date. The timeframe begins at noon on the beginning and end dates. Click Apply to see your selected multi-day timeframe.
Longer timeframes will decrease metrics granularity. At the default timeframe, based on your browser viewport, each "tick" on charts represents one second. If you select a timeframe of 6 hours, each tick represents the average value across a larger period of time.
You can only see metrics as far back in history as your metrics retention policy allows. Netdata uses an internal time-series database (TSDB) to store as many metrics as it can within a specific amount of disk space. The default storage is 256 MiB, which should be enough for 1-3 days of historical metrics. If you navigate back to a timeframe beyond stored historical metrics, you'll see this message:
At any time, configure the internal TSDB's storage capacity to expand your depth of historical metrics.
One useful next step after selecting a timeframe is exporting the metrics into a snapshot file, which can then be shared and imported into any other Netdata dashboard.
There are also many ways to customize the standard dashboard experience, from changing the theme to editing the text that accompanies every section of charts.