I cannot find though postlogs command inside the Solr bin dir (there is post
command though) nor a way to create the logs collection. I've looked into
solr-8.4.1 and solr-7.5.0 but could not find anything.
1) Is this still supported?
2) Where can I find the logs collection configuration? How can I create it?
3) Is post the same command as postlogs?
While the tool is only included in 8.5 and higher, it will index logs from any version of Solr 7.x or 8.x (and possibly even 6.x). So if you want to use it, you could download Solr 8.5 or higher to your local machine and index your 8.4.1 logs there, or use an 8.5 or higher Docker image. You probably need to copy them locally; AFAIK, it can't take a URL to go get files from a non-local filestore like S3, etc.