I had a discussion - no, it was more a lobotomy - with one of our "experts"

I was kinda confused, as he had several grafana tabs open and an query editor...

He explained to me that he debugs and optimizes his query based on the grafana data....

Elasticsearch cluster with several hundred, different indices, > 20 TB data

I explained to him the scrape interval of 5secs, that he cannot distinguish his query from other queries, that there is far too much of an interference... Let alone that a 5 sec scrape interval is a very loooong time.....

Nope. It makes perfect sense to him and he'll continue to work like this.