Which functionality do you want to make?
add-on means in Jira, so JVM based things can be like java, scala, groovy, jruby, jython etc.
But the main idea of that tools , it's cover some functionality, hence please. start from functionality and do external app which will communicate via REST Api.
for building elastic + grafana or kibana
but you should to know what kind of dashboard would you like to make?
maybe someone already made in Jira, already
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