The graph depicts the result of one or more tests of metadata responsiveness, using a line for each test's target. Each test runs a small binary that performs a stat() of each file in the directory that is the target of the test. The x-axis is wall-clock time, and the y-axis is the time it took to complete the test. The intention is that each test is equivalent to running "time ls -l <path>". The graph is updated regularly at intervals as specified below. N.B. The source data is updated regularly at intervals controlled by the data collection process, and that interval does not change when the display update interval changes. Currently, data is sampled at one minute intervals. That value will be reduced once the utility goes into production. The period over which data is displayed (the "window") can be adjusted using the slider below. For very long windows the graph summarizes the data by binning up samples and displaying a statistic for each bin: average, minimum, maximum, first, or last.