Reading the web site, I just noticed the open-source version does not have "Log query endpoints".
Does that mean you have to use SQL (or the visual SQL builder) to query logs, and you don't get access to a log query language the way Kibana gives you KQL and Lucene syntax?
If so, I think it's a little disingenuous to write an article comparing the ELK stack, which is open source and comes with a perfectly usable query UI, to Greptime's equivalent, which is not.