don't have an example for that in open source but I can tell you what we did and what
ql.io feature we leveraged.
1) Made a call to a server to can ips for machines in a cluster and the next objective was to call the same url on all these machines.
2) A table was pred-defined to help call one of these machines and we provided a fake url e.g
create table cluster_machine on select get from http://fakeurl .... 2.1) In this table we had provided a 'patch uri' monkey patch which was reading the params and return a list of uris (not just one uri)
3) called select on that table