Measures put in place to prevent plagiarism, conflict of interest, dealing with errata, dealing with self-citations. 

Examples:

• African Population Studies Ethics and Malpractice Statement

• Journal of Internet Services and Information Security Ethics and Malpractice Statement

"Publication Ethics: A journal shall also have policies on publishing ethics. These should be clearly visible on its website, and should refer to: i) Journal policies on authorship and contributorship; ii) How the journal will handle complaints and appeals; iii) Journal policies on conflicts of interest / competing interests; iv) Journal policies on data sharing and reproducibility; v) Journal’s policy on ethical oversight; vi) Journal’s policy on intellectual property; and vii) Journal’s options for post-publication discussions and corrections." COPE Principles of Transparency

See also: COPE Ethical Oversight