TensorBoard 2.2.0

[bileschi]

No description provided.

[wchargin]

I started a review on #3398 before that PR was closed, so all my draft
comments are there; would you mind reading those so that I don’t have to
copy them all over? Thanks!

Direct link: #3398 (review)

[wchargin]

Once #3400 merges (unbreaking tensorboard dev list), we’ll want to
fast-forward the 2.2 branch to include it:

$ git fetch origin master
$ git push origin origin/master:2.2

Then you can rebase your changes onto the new version:

$ git checkout 2.2
$ git rebase origin/2.2
$ git push --force-with-lease bileschi 2.2

Should be no need to delete any branches or force-push to upstream.

(I seem to remember that origin is the name of your remote for this
repo and bileschi is the name of your remote for your fork; if not,
replace accordingly above.)

[wchargin]

Looks good modulo typo.

[wchargin]

Looks good to me. As this is a release PR, you may want to get a second
pair of eyes for a sanity check.

Please remember to rebase and merge (not squash and merge) when
merging this PR.