We are developing a solution that will integrate to Jira and I wanted to ask if you knows what are the versions that are adopted and what are the percentage of each version. Even non accurate estimations are welcome.
That's going to be impossible to tell - Atlassian might be able to give you some numbers based on their licenses but it's not going to tell you what is out there in the wild.
I'm still working with large corporates using Jira 3, having no resource (or in one case, desire) to upgrade. However, I wouldn't bother with coding for anything below 4.3 - people on Jira 3 who haven't the resource to upgrade to 4 also don't have the resource to consider plugins generally.
I say 4.3 rather than 4.x because there was a hefty change to the user handling between 4.2 and 4.3. I'd would strongly consider not bothering to make the effort to code for the old system - lots of work and a quite small user base for it. From experience, most people who are on 4.x are probably on 4.4 - there's a strong tendency for people who can afford to upgrade to jump to the latest version within the major release. On top of that, I've found a lot of stuff that I've taken from below 4.2 and updated for 4.3 or 4.4 seems to work with little or no effort in 5.x
i can't give you exact numbers, but in our customerbase we see mostly JIRA 4.4.x, 5.0.x and 5.1.x.
If you target enterprises, you probably will want to implement your plugin for JIRA 4.4.x, otherwise targeting 5.0 and 5.1 should be sufficient and most cost effective.
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