Samples

A store sample's own time, its epoch column in milliseconds: its output may reach the reader late.

The first sample at or after time, else the last one before it.

The last sample at or before time, else the first one after it.

line split by separator into numbers named names, or null when it is not such a line.

/proc/diskstats as each disk's cumulative counters, <disk>:<counter>: writes completed, writeKb, writeMs (the time those writes took), flushes and flushMs (Linux 5.5 on: the cache flushes an fsync issues), and ioMs (the time the disk was busy). A disk's line counts its partitions' I/O, so partitions are left out, and so are loop and RAM devices.

The per-second rate of each of keys between consecutive samples, from the last one at or before the window's start to the first at or after its end; t is the later sample's second in the window.

A /proc/<pid>/stat line as the process's CPU seconds (user and system, clockTicks a second) and resident memory (pageKb a page), or null when it is not one. The command name may hold spaces: the fields follow its ).

value as a Long when it is whole, for counters.

The lines of samples that arrived inside window.