Summary

Fixes counter wraparound issue in diskio plugin that was causing io_util, io_svctm, and io_await metrics to occasionally produce massive values in the trillions instead of expected decimal values.

Root cause: Lines calculating deltas like deltaIOTime := float64(io.IoTime - lastValue.IoTime) don't account for counter wraparound scenarios.

Example

Before (with bug)

diskio,name=sda reads=1234,writes=5678,read_bytes=987654,io_time=12345,io_util=2847391847382.3,io_await=9847382947.2,io_svctm=8472947.1 

After (during wraparound detection):

diskio,name=sda reads=1234,writes=5678,read_bytes=987654,io_time=12345,io_util=0.0,io_await=0.0,io_svctm=0.0
# Zero values provided instead of trillion-scale incorrect values

After (normal operation resumes):

diskio,name=sda reads=1234,writes=5678,read_bytes=987654,io_time=12345,io_util=15.2,io_await=2.3,io_svctm=1.1

Checklist

• No AI generated code was used in this PR

Related issues

resolves #17408