Hello Is there any recommended zookeeper version for Druid 31.0.0 ? I can see that embedded version in pom.xml is 3.8.4 but will there be potential issues if we go with 3.9.3 ?

i think 3.9 should be OK, as far as i know a 3.9 server does not have compatibility issues with 3.8 clients [we will of course be using a 3.8.4 client]