But maybe you want to delay this change, since the README is a landing point and people might still using the older API.

Codecov Report

Merging #2507 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2507   +/-   ##
=======================================
  Coverage   44.74%   44.74%           
=======================================
  Files          93       93           
  Lines        9559     9559           
=======================================
  Hits         4277     4277           
  Misses       4589     4589           
  Partials      693      693

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 985920c...e22f196. Read the comment docs.

LGTM

I think the README should reflect the current code. Not sure what replaces that functionality though

LGTM

Adding this here for posterity because I was curious:

It was replaced during the v2 runtime PR; now the client side implementation in ctr tasks (and test code) has a non-exported options helper: https://github.com/containerd/containerd/blob/master/cmd/ctr/commands/tasks/checkpoint.go#L77-L101