Reading measurement histories

Open a history using a reading name, value or History ↗.

The history dialog offers the time ranges Last hour, Last 6 hours, Last 24 hours, Last 7 days, Last 30 days, 90 days, 1 year and 2 years. The availability of older values depends on the configured retention period and on when the measurement was created.

Display	Meaning
Curve	Averages within time windows
Shading	Minimum to maximum within a time window
Dashed lines	Configured warning and critical thresholds, where present
Gaps	Missing readings or checks that did not take place
Red markers	Failed queries or missing values

Move the pointer over the curve to see the timestamp, average, minimum/maximum, number of measurements and missing values. After giving the chart keyboard focus, use the arrow keys to move through the data points.

Below the chart, you will find Measurements, Average, Minimum, Maximum and Missing values. Measurements as table shows the same aggregated time windows. For resources, average used, free and total values are also available; for service checks, the last result within the time window is shown. The table does not list every individual unaggregated measurement.

Time windows keep long charts clear. All values within each window are included in the analysis; peaks are retained as the minimum and maximum. For ranges of seven days or more, hourly long-term values are used. Times in the interface refer to the browser. Short pauses and missing data must not be interpreted as successful measurements.