This message ended up in my spam box for some reason, sorry for the late
reply.
We typically release a new version twice a year, and support two
versions at a time. So right now we are releasing version 1.20 and will
support 1.19 and 1.20 for the next period. When 1.21 is released, we
will support 1.20 and 1.21. Support for the released version is limited
to bug fixes.
Is this two-version thing actually something we're committed to doing? Chuck started doing it at some point, which as release manager is his decision - but I don't think we ever really decided or announced this as a policy.
If we're committed to it, we should probably mention it somewhere in the docs or release how-to. And I should go update our Tidelift data.
Cheers,
Ralf