disabling upgrades on new machines by default?

[Kapil Thangavelu]

juju can save minutes per machine (especially against release images) if we
turn off upgrades by default. At the moment in juju 1.21 (dev) there's a
setting  os-enable-upgrade: false that will do just that (apt-get update
but not upgrade) but thats not by default. i wanted to raise the question
of doing that by default.. thoughts opinions.. heartbleeds / shellshocks?

cheers,

Kapil
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