That depends, it would be annoying if you open lots of issues for minor, unimportant issues. But if you find a few major problems its good to report them. Of course its always ideal if you submit fixes as well, because there are never enough devs.
I think its better to detect something early even if there is not a fix as it at least can be triaged and others can fix it if the original reporter is unable to devote the time or whatever
I do have a Sonarqube server somewhere around. Is it considered an annoying behavior to scan an open source project and open issues for others to fix?
That depends, it would be annoying if you open lots of issues for minor, unimportant issues. But if you find a few major problems its good to report them. Of course its always ideal if you submit fixes as well, because there are never enough devs.
I’m way too lazy to code when I’m off work
I think its better to detect something early even if there is not a fix as it at least can be triaged and others can fix it if the original reporter is unable to devote the time or whatever