Consul Support Lifecycle

Im trying to explain a software upgrade strategy to our customer. Part of the solutions is consul. I couldnt find any information on how long a specific version is “supported” by the community / hashcorp. I found the reccomendation to be no further behind than two versions. But that doenst let me plan in the furture since consul doenst seem to follow a fixed release schedule.
Is the more information on this topic available?

Best,
Johannes