Hello sir, 1 month ago i use vyos 1.4 and i used features bridge vlan aware. Then now i use vyos 1.2 but i cannot use vlan aware bridge becuase in the bridge i dont see enable-vlan, anyone can help me? Should i back again to 1.4?
For new deployments I would recommend looking at 1.4 or even 1.5.
Sure they are “rolling” but at the same time includes upgrades and fixes which both the 1.2 and 1.3 are missing.
If you for whatever reason is still using 1.2.9 its time to think about the future 
Hi xitepo!
For the first 1.2.9 is no longer supported, and will not get any updates og given any support.
vlan-aware bridging is also not supported in 1.2. I think support for that is introduced in 1.3.
1.4/1.5 should be stable enough for home/not critical use, but if you want to use long term supported releases you could buy the official LTS release, contribute or build it yourself. (its quite easy if you have a bit linux knowledge: Build VyOS — VyOS 1.3.x (equuleus) documentation )