Monit What does "Read Bytes" refer to?

[smarty2651]

I am monitoring a process for 'Domoticz' home automation software.
This is a snippett of the info I get.
....
Total filedescriptors   37
Read bytes   14.5 kB/s [8.3 GB total]
Disk read bytes   0 B/s [6.9 MB total]
.....

My question is the "Read Bytes" line. What does this refer to?