3.2

The pause container is built with the correct "Architecture" metadata. (#87954, @BenTheElder)

3.1

The pause container gains a signal handler to clean up orphaned zombie processes. (#36853, @verb)
pause -v will return build information for the pause binary. (#56762, @verb)

3.0

The pause container was rewritten entirely in C. (#23009, @uluyol)