When you a clickhouse cluster and you run queries on all the replicas it's not easy to get all the queries ran. I use
system.query_log all the time to check timings, errors and so on.
So what I do is create a global query_log:
:) create view query_log_all on cluster my_cluster as select * from remote('10.0.0.1,10.0.0.2', 'system.query_log')
So I can inspect queries in all the replicas with a single query: