Squashed commit of the following:

commit 14bddba1482de035ca416368f918d94b115d3660
Merge: df079fc 9a66b71
Author: crusaderky <crusaderky@gmail.com>
Date:   Tue Jan 25 17:16:58 2022 +0000

    Merge branch 'main' into AMM/RetireWorker

commit df079fc
Merge: 9676934 5835ce3
Author: crusaderky <crusaderky@gmail.com>
Date:   Mon Jan 24 15:08:51 2022 +0000

    Merge branch 'AMM/staging' into AMM/RetireWorker

commit 5835ce3
Merge: ee68b02 b0b8e95
Author: crusaderky <crusaderky@gmail.com>
Date:   Mon Jan 24 15:07:27 2022 +0000

    Merge branch 'AMM/test_close_gracefully' into AMM/staging

commit ee68b02
Merge: 7d4e6ee ccad288
Author: crusaderky <crusaderky@gmail.com>
Date:   Mon Jan 24 15:06:50 2022 +0000

    Merge branch 'main' into AMM/staging

commit b0b8e95
Author: crusaderky <crusaderky@gmail.com>
Date:   Mon Jan 24 14:32:29 2022 +0000

    Code review

commit 9676934
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 14:50:53 2022 +0000

    AMM to manage retire_workers()

commit 7d4e6ee
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 14:39:41 2022 +0000

    Fix flaky test_close_gracefully and test_lifetime (dask#5677)

commit 7faab51
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 14:39:41 2022 +0000

    harden test

commit aef3b71
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 14:29:10 2022 +0000

    Increase resilience on slow CI

commit af84e40
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 12:39:18 2022 +0000

    Dump cluster state on all test failures (dask#5674)

commit 5054c19
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 12:38:38 2022 +0000

    Paused workers shouldn't steal tasks (dask#5665)

commit eadb35f
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 12:37:48 2022 +0000

    transition flight to missing if no who_has (dask#5653)

commit 581aee8
Merge: 940bb45 60c0d60
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 12:36:09 2022 +0000

    Merge branch 'main' into AMM/test_close_gracefully

commit 940bb45
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 12:20:10 2022 +0000

    tweak comment

commit 731d132
Author: crusaderky <crusaderky@gmail.com>
Date:   Fri Jan 21 12:12:03 2022 +0000

    Fix flaky test_close_gracefully and test_lifetime