Krikri::SerialBatches
serial: - real Ansible runs the WHOLE play against one batch of
hosts at a time instead of every host at once, which is what makes a
rolling restart rolling. This engine previously ignored the keyword
entirely, so serial: 1 still hit every host simultaneously.
Class methods
order: - how hosts are sequenced before serial: batches them.
Verified against ansible-core 2.19.4 over an inventory listing
h3, h1, h2: inventory keeps that order, sorted gives h1 h2 h3,
reverse_sorted h3 h2 h1, and reverse_inventory h2 h1 h3 (the
inventory order reversed, NOT a sort).
Splits hosts according to the play's serial tokens. Each token is
either a count ("2") or a percentage of the TOTAL host count
("50%", rounded up); the last token sizes every remaining batch.
Verified against ansible-core 2.19.4 for 1, 2, "50%" and
[1, 2] over four hosts.